Bump actions/cache from 4 to 5

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](https://github.com/actions/cache/compare/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>

.github/workflows/python-integration-tests.yml

@@ -424,7 +424,7 @@ jobs:
           pattern: test-results-*
           path: test-results/
       - name: Restore flaky report history cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           path: python/flaky-report-history.json
           key: flaky-report-history-integration-${{ github.run_id }}
@@ -441,7 +441,7 @@ jobs:
         run: cat flaky-test-report.md >> $GITHUB_STEP_SUMMARY
       - name: Save flaky report history cache
         if: always()
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           path: python/flaky-report-history.json
           key: flaky-report-history-integration-${{ github.run_id }}