AO3-6951 Bump reviewdog/action-rubocop from 2.21.0 to 2.21.2 (#5110)

Bump reviewdog/action-rubocop from 2.21.0 to 2.21.2

Bumps [reviewdog/action-rubocop](https://github.com/reviewdog/action-rubocop) from 2.21.0 to 2.21.2.
- [Release notes](https://github.com/reviewdog/action-rubocop/releases)
- [Commits](reviewdog/action-rubocop@cd8c294...fcb74ba)

---
updated-dependencies:
- dependency-name: reviewdog/action-rubocop
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/reviewdog.yml

@@ -23,7 +23,7 @@ jobs:
           bundler-cache: true
 
       - name: rubocop
-        uses: reviewdog/action-rubocop@cd8c2943f425b54f97095777109ae9f1f2d79a61
+        uses: reviewdog/action-rubocop@fcb74ba274da10b18d038d0bcddaae3518739634
         with:
           use_bundler: true
           reporter: github-pr-check