CI: bump actions/cache from 4.1.2 to 4.2.0

Bumps [actions/cache](https://github.com/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](https://github.com/actions/cache/compare/v4.1.2...1bd1e32a3bdc45362d1e726936510720a7c30a57)

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

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

Closes #15817

.github/workflows/non-native.yml

@@ -332,7 +332,7 @@ jobs:
         run: sudo apt-get --quiet 2 --option Dpkg::Use-Pty=0 install libfl2 ${{ matrix.build == 'cmake' && 'ninja-build' || '' }}
 
       - name: 'cache compiler (djgpp)'
-        uses: actions/cache@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4
+        uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
         id: cache-compiler
         with:
           path: ~/djgpp