build(deps-dev): bump rexml from 3.2.8 to 3.2.9

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.8 to 3.2.9.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.8...v3.2.9)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -20,8 +20,8 @@ GEM
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.9.2)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
+    rexml (3.2.9)
+      strscan
     rubocop (1.50.2)
       json (~> 2.3)
       parallel (~> 1.10)