Bump rouge from 4.1.3 to 4.2.0 (#142)

Bumps [rouge](https://github.com/rouge-ruby/rouge) from 4.1.3 to 4.2.0.
- [Release notes](https://github.com/rouge-ruby/rouge/releases)
- [Changelog](https://github.com/rouge-ruby/rouge/blob/master/CHANGELOG.md)
- [Commits](rouge-ruby/rouge@v4.1.3...v4.2.0)

---
updated-dependencies:
- dependency-name: rouge
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -56,7 +56,7 @@ GEM
     rake (13.0.6)
     regexp_parser (2.8.2)
     rexml (3.2.6)
-    rouge (4.1.3)
+    rouge (4.2.0)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)