bump gh-pages gem and specify ruby 2.7 (#169)

jekyll 3.9, required by github-pages does not work well with ruby 3.0.
set ruby version to 2.7 in Gemfile as well as update dep versions.

Author: benharri

Gemfile

@@ -7,9 +7,9 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-# gem "jekyll", "~> 4.2.0"
-# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
-# uncomment the line below. To upgrade, run `bundle update github-pages`.
+
+ruby '~> 2.7'
+
 gem "github-pages", group: :jekyll_plugins
 # If you have any plugins, put them here!
 group :jekyll_plugins do

Gemfile.lock

@@ -1,13 +1,13 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.0.3.7)
+    activesupport (6.0.4.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2, >= 2.2.2)
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     coffee-script (2.4.1)
       coffee-script-source
@@ -16,30 +16,40 @@ GEM
     colorator (1.1.0)
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
-    concurrent-ruby (1.1.8)
-    dnsruby (1.61.5)
+    concurrent-ruby (1.1.9)
+    dnsruby (1.61.7)
       simpleidn (~> 0.1)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     ethon (0.14.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
-    execjs (2.7.0)
-    faraday (1.4.1)
+    execjs (2.8.1)
+    faraday (1.8.0)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
       faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0.1)
       faraday-net_http (~> 1.0)
       faraday-net_http_persistent (~> 1.1)
+      faraday-patron (~> 1.0)
+      faraday-rack (~> 1.0)
       multipart-post (>= 1.2, < 3)
       ruby2_keywords (>= 0.0.4)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
     faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
     faraday-net_http (1.0.1)
-    faraday-net_http_persistent (1.1.0)
-    ffi (1.15.0)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    faraday-rack (1.0.0)
+    ffi (1.15.4)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
-    github-pages (214)
-      github-pages-health-check (= 1.17.0)
+    github-pages (219)
+      github-pages-health-check (= 1.17.7)
       jekyll (= 3.9.0)
       jekyll-avatar (= 0.7.0)
       jekyll-coffeescript (= 1.1.1)
@@ -59,19 +69,19 @@ GEM
       jekyll-seo-tag (= 2.7.1)
       jekyll-sitemap (= 1.4.0)
       jekyll-swiss (= 1.0.0)
-      jekyll-theme-architect (= 0.1.1)
-      jekyll-theme-cayman (= 0.1.1)
-      jekyll-theme-dinky (= 0.1.1)
-      jekyll-theme-hacker (= 0.1.2)
-      jekyll-theme-leap-day (= 0.1.1)
-      jekyll-theme-merlot (= 0.1.1)
-      jekyll-theme-midnight (= 0.1.1)
-      jekyll-theme-minimal (= 0.1.1)
-      jekyll-theme-modernist (= 0.1.1)
-      jekyll-theme-primer (= 0.5.4)
-      jekyll-theme-slate (= 0.1.1)
-      jekyll-theme-tactile (= 0.1.1)
-      jekyll-theme-time-machine (= 0.1.1)
+      jekyll-theme-architect (= 0.2.0)
+      jekyll-theme-cayman (= 0.2.0)
+      jekyll-theme-dinky (= 0.2.0)
+      jekyll-theme-hacker (= 0.2.0)
+      jekyll-theme-leap-day (= 0.2.0)
+      jekyll-theme-merlot (= 0.2.0)
+      jekyll-theme-midnight (= 0.2.0)
+      jekyll-theme-minimal (= 0.2.0)
+      jekyll-theme-modernist (= 0.2.0)
+      jekyll-theme-primer (= 0.6.0)
+      jekyll-theme-slate (= 0.2.0)
+      jekyll-theme-tactile (= 0.2.0)
+      jekyll-theme-time-machine (= 0.2.0)
       jekyll-titles-from-headings (= 0.5.3)
       jemoji (= 0.12.0)
       kramdown (= 2.3.1)
@@ -82,16 +92,16 @@ GEM
       nokogiri (>= 1.10.4, < 2.0)
       rouge (= 3.26.0)
       terminal-table (~> 1.4)
-    github-pages-health-check (1.17.0)
+    github-pages-health-check (1.17.7)
       addressable (~> 2.3)
       dnsruby (~> 1.60)
       octokit (~> 4.0)
-      public_suffix (>= 2.0.2, < 5.0)
+      public_suffix (>= 3.0, < 5.0)
       typhoeus (~> 1.3)
     html-pipeline (2.14.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (3.19.1)
+    html-proofer (3.19.2)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
@@ -160,45 +170,45 @@ GEM
     jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-swiss (1.0.0)
-    jekyll-theme-architect (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-architect (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-cayman (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-cayman (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-dinky (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-dinky (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-hacker (0.1.2)
+    jekyll-theme-hacker (0.2.0)
       jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-leap-day (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-leap-day (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-merlot (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-merlot (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-midnight (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-midnight (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-minimal (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-minimal (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-modernist (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-modernist (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-primer (0.5.4)
+    jekyll-theme-primer (0.6.0)
       jekyll (> 3.5, < 5.0)
       jekyll-github-metadata (~> 2.9)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-slate (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-slate (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-tactile (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-tactile (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
-    jekyll-theme-time-machine (0.1.1)
-      jekyll (~> 3.5)
+    jekyll-theme-time-machine (0.2.0)
+      jekyll (> 3.5, < 5.0)
       jekyll-seo-tag (~> 2.0)
     jekyll-titles-from-headings (0.5.3)
       jekyll (>= 3.3, < 5.0)
@@ -213,24 +223,28 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.5.1)
+    listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
+    mini_portile2 (2.6.1)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.14.4)
     multipart-post (2.1.1)
-    nokogiri (1.11.5-x86_64-linux)
+    nokogiri (1.12.4)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
+    nokogiri (1.12.4-x86_64-linux)
       racc (~> 1.4)
     nokogumbo (2.0.5)
       nokogiri (~> 1.8, >= 1.8.4)
     octokit (4.21.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.20.1)
+    parallel (1.21.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
@@ -243,8 +257,8 @@ GEM
     rouge (3.26.0)
     ruby-enum (0.9.0)
       i18n
-    ruby2_keywords (0.0.4)
-    rubyzip (2.3.0)
+    ruby2_keywords (0.0.5)
+    rubyzip (2.3.2)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -265,13 +279,14 @@ GEM
       thread_safe (~> 0.1)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.7.7)
-    unicode-display_width (1.7.0)
+    unf_ext (0.0.8)
+    unicode-display_width (1.8.0)
     webrick (1.7.0)
     yell (2.2.2)
     zeitwerk (2.4.2)
 
 PLATFORMS
+  ruby
   x86_64-linux
 
 DEPENDENCIES
@@ -285,5 +300,8 @@ DEPENDENCIES
   wdm (~> 0.1.1)
   webrick (~> 1.7)
 
+RUBY VERSION
+   ruby 2.7.4p191
+
 BUNDLED WITH
-   2.2.20
+   2.2.22