Bump actions/cache from 4 to 5 (#243)

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/asv-nightly.yml

@@ -51,7 +51,7 @@ jobs:
         echo "yesterday=$(date -d yesterday +'%Y-%m-%d')" >> $GITHUB_OUTPUT
         echo "today=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
     - name: Use last nightly commit hash from cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{env.WORKING_DIR}}
         key: nightly-results-${{steps.nightly-dates.outputs.yesterday}}
@@ -66,7 +66,7 @@ jobs:
         fi
         echo $CURRENT_HASH > $HASH_FILE
     - name: Update last nightly hash in cache
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{env.WORKING_DIR}}
         key: nightly-results-${{steps.nightly-dates.outputs.today}}