Bump actions/cache from 4.1.2 to 4.2.0 in the dependencies group

Bumps the dependencies group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `actions/cache` from 4.1.2 to 4.2.0
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4.1.2...v4.2.0)

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

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -107,7 +107,7 @@ jobs:
       - uses: actions/download-artifact@v4
         with:
           name: build-manifest
-      - uses: actions/cache@v4.1.2
+      - uses: actions/cache@v4.2.0
         if: ${{ matrix.entry.rubies_cache_key != null }}
         with:
           path: ./rubies