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] <support@github.com>

.github/workflows/cross.yml

@@ -57,7 +57,7 @@ jobs:
 
       - name: LLVM MinGW toolchain cache configuration
         id: cache-llvm-mingw-toolchain
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         if: startsWith(matrix.image, 'ubuntu-') && contains(matrix.target, 'gnullvm') && matrix.version == 'nightly'
         with:
           path: ${{ env.LLVM-MINGW-TOOLCHAIN-NAME }}