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/ci.yml

@@ -52,7 +52,7 @@ jobs:
           mkdir -p ${{ env.NUMBA_CACHE_DIR }}
           echo "timestamp=$(/bin/date -u '+%Y%m%d%H%M%S')" >> $GITHUB_OUTPUT
       - name: Cache Numba Kernels
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           key: numba-cache-${{ matrix.python-version }}-${{ steps.numba-key.outputs.timestamp }}
           restore-keys: numba-cache-${{ matrix.python-version }}-