Bump actions/cache from 4.0.2 to 4.1.2 in /.github/workflows

Bumps [actions/cache](https://github.com/actions/cache) from 4.0.2 to 4.1.2.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@0c45773...6849a64)

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

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

.github/workflows/tests.yml

@@ -77,7 +77,7 @@ jobs:
         run: echo "HASH=${{ runner.os }}-${{ runner.arch }}-Py${{ matrix.python-version }}-$(date -u "+%Y%m")" >> $GITHUB_ENV
 
       - name: Cache Conda
-        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        uses: actions/cache@6849a6489940f00c2f30c0fb92c6274307ccb58a # v4.1.2
         with:
           path: ~/conda_pkgs_dir
           key: cache-${{ env.HASH }}