Bump rouge from 4.2.0 to 4.2.1 (#165)

Bumps [rouge](https://github.com/rouge-ruby/rouge) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/rouge-ruby/rouge/releases)
- [Changelog](https://github.com/rouge-ruby/rouge/blob/master/CHANGELOG.md)
- [Commits](rouge-ruby/rouge@v4.2.0...v4.2.1)

---
updated-dependencies:
- dependency-name: rouge
  dependency-type: direct:production
  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

@@ -312,7 +312,7 @@ GEM
       actionpack (>= 5.2)
       railties (>= 5.2)
     rexml (3.2.6)
-    rouge (4.2.0)
+    rouge (4.2.1)
     rspec-core (3.12.2)
       rspec-support (~> 3.12.0)
     rspec-expectations (3.12.3)