Deps vulnerability fixes, README update and CI-CD image update

Author: EmilianoSanchez

.github/workflows/ci-cd.yml

@@ -19,8 +19,7 @@ permissions:
 jobs:
   build:
     name: Build
-    # @TODO rollback to ubuntu-latest eventually. ATM, `npm run test-browser` fails when using ubuntu-latest (ubuntu-22.04) with "ERROR [launcher]: Cannot start ChromeHeadless"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/sonar-scan.yml

@@ -12,7 +12,7 @@ on:
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/update-license-year.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4

README.md

@@ -65,6 +65,7 @@ Split has built and maintains SDKs for:
 * .NET [Github](https://github.com/splitio/dotnet-client) [Docs](https://help.split.io/hc/en-us/articles/360020240172--NET-SDK)
 * Android [Github](https://github.com/splitio/android-client) [Docs](https://help.split.io/hc/en-us/articles/360020343291-Android-SDK)
 * Angular [Github](https://github.com/splitio/angular-sdk-plugin) [Docs](https://help.split.io/hc/en-us/articles/6495326064397-Angular-utilities)
+* Elixir thin-client [Github](https://github.com/splitio/elixir-thin-client) [Docs](https://help.split.io/hc/en-us/articles/26988707417869-Elixir-Thin-Client-SDK)
 * Flutter [Github](https://github.com/splitio/flutter-sdk-plugin) [Docs](https://help.split.io/hc/en-us/articles/8096158017165-Flutter-plugin)
 * GO [Github](https://github.com/splitio/go-client) [Docs](https://help.split.io/hc/en-us/articles/360020093652-Go-SDK)
 * iOS [Github](https://github.com/splitio/ios-client) [Docs](https://help.split.io/hc/en-us/articles/360020401491-iOS-SDK)