Bump actions/cache from 1 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 1 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v1...v4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
 
  - name: Cache Homebrew Bundler RubyGems
  id: cache
- uses: actions/cache@v1
+ uses: actions/cache@v4
  with:
  path: ${{ steps.set-up-homebrew.outputs.gems-path }}
  key: ${{ runner.os }}-rubygems-${{ steps.set-up-homebrew.outputs.gems-hash }}