Bump mislav/bump-homebrew-formula-action from 3.0 to 3.1

Bumps [mislav/bump-homebrew-formula-action](https://github.com/mislav/bump-homebrew-formula-action) from 3.0 to 3.1.
- [Release notes](https://github.com/mislav/bump-homebrew-formula-action/releases)
- [Commits](https://github.com/mislav/bump-homebrew-formula-action/compare/v3.0...v3.1)

---
updated-dependencies:
- dependency-name: mislav/bump-homebrew-formula-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/release.yml

@@ -8,7 +8,7 @@ jobs:
     name: Bump Homebrew formula
     runs-on: ubuntu-latest
     steps:
-      - uses: mislav/bump-homebrew-formula-action@v3.0
+      - uses: mislav/bump-homebrew-formula-action@v3.1
         if: "!contains(github.ref, '-')" # skip prereleases
         with:
           formula-name: rbenv