Build(deps): Bump rexml from 3.3.7 to 3.3.8 (#29019)

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.7 to 3.3.8.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](https://github.com/ruby/rexml/compare/v3.3.7...v3.3.8)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -406,7 +406,7 @@ GEM
       io-console (~> 0.5)
     request_store (1.7.0)
       rack (>= 1.4)
-    rexml (3.3.7)
+    rexml (3.3.8)
     rinku (2.0.6)
     rotp (6.3.0)
     rouge (4.4.0)