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/ci.yml

@@ -89,7 +89,7 @@ jobs:
       # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#update-a-cache
       - name: Restore cached hypothesis directory
         id: restore-hypothesis-cache
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           path: .hypothesis/
           key: cache-hypothesis-${{ runner.os }}-${{ github.run_id }}
@@ -103,7 +103,7 @@ jobs:
       - name: Save cached hypothesis directory
         id: save-hypothesis-cache
         if: always() && steps.unit-test.outcome != 'skipped'
-        uses: actions/cache/save@v4
+        uses: actions/cache/save@v5
         with:
           path: .hypothesis/
           key: cache-hypothesis-${{ runner.os }}-${{ github.run_id }}