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>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -59,7 +59,7 @@ jobs:
           python -m pip install --user --upgrade pip
           echo "dir=$(pip cache dir)" >> ${GITHUB_OUTPUT}
       - name: "Create/Restore cache"
-        uses: "actions/cache@v3"
+        uses: "actions/cache@v4"
         with:
           path: |
             ${{ steps.pip-cache.outputs.dir }}/**