chore(deps): bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/rspec.yml

@@ -17,7 +17,7 @@ jobs:
         ruby: ["3.0", "3.1", "3.2"]
     steps:
       - uses: actions/[email protected]
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: /home/runner/bundle
           key: bundle-${{ matrix.ruby }}-${{ hashFiles('**/*.gemspec') }}