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

@@ -39,7 +39,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - name: Cache redis build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: tmp/cache
           key: "local-tmp-cache-${{ matrix.redis }}-on-${{ matrix.os }}"
@@ -71,7 +71,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - name: Cache redis build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: tmp/cache
           key: "local-tmp-cache-${{ matrix.redis }}-on-${{ matrix.os }}"
@@ -106,7 +106,7 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - name: Cache redis build
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: tmp/cache
           key: "local-tmp-cache-${{ matrix.redis }}-on-${{ matrix.os }}"