[dependabot]: Bump actions/cache from 4 to 5 in the actions group (#73)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mne[bot] <50266005+mne-bot@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -60,7 +60,7 @@ jobs:
         working-directory: ./mne-python
       - run: python -c "import mne; print(mne.datasets.testing.data_path(verbose=True))"
         name: Get test data
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           key: ${{ env.TESTING_VERSION }}
           path: ~/mne_data