Bump reviewdog/action-rubocop from 1 to 2 (#85)

Bumps [reviewdog/action-rubocop](https://github.com/reviewdog/action-rubocop) from 1 to 2.
- [Release notes](https://github.com/reviewdog/action-rubocop/releases)
- [Commits](reviewdog/action-rubocop@v1...v2)

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

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

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           ruby-version: ${{ env.RUBY_VERSION }}
       - name: Run rubocop with reviewdog
-        uses: reviewdog/action-rubocop@v1
+        uses: reviewdog/action-rubocop@v2
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           rubocop_version: gemfile