github-actions: bump actions/cache from 4.0.0 to 4.2.0

Bumps [actions/cache](https://github.com/actions/cache) from 4.0.0 to 4.2.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v4...v4.2.0)

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

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