Bump actions/cache from 4.2.3 to 4.2.4

Bumps [actions/cache](https://github.com/actions/cache) from 4.2.3 to 4.2.4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4.2.3...v4.2.4)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 4.2.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -58,7 +58,7 @@ jobs:
         echo "dir=$(pip cache dir)" >> "${GITHUB_OUTPUT}"
       shell: bash
     - name: Cache PyPI
-      uses: actions/[email protected].3
+      uses: actions/[email protected].4
       with:
         key: pip-ci-${{ runner.os }}-${{ matrix.pyver }}-${{ matrix.no-extensions }}-${{ hashFiles('requirements/*.txt') }}
         path: ${{ steps.pip-cache.outputs.dir }}