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](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>

Author: dependabot[bot]

.github/workflows/integration-unreleased.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Restore cached build
         id: cache-restore
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           path: opensearch/distribution/archives/linux-tar/build/distributions
           key: ${{ steps.get-key.outputs.key }}
@@ -45,7 +45,7 @@ jobs:
 
       - name: Save cached build
         if: steps.cache-restore.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           path: opensearch/distribution/archives/linux-tar/build/distributions
           key: ${{ steps.get-key.outputs.key }}