Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
         run: echo "directory=$(composer config cache-dir)" >> $GITHUB_OUTPUT
 
       - name: Cache composer dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ${{ steps.composer-cache.outputs.directory }}
           key: ${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}