Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
 
             -   id: composer-cache-dependencies
                 name: Cache Composer dependencies
-                uses: actions/cache@v4
+                uses: actions/cache@v5
                 with:
                     path: ${{ steps.composer-cache-vars.outputs.dir }}
                     key: ${{ runner.os }}-composer-${{ matrix.php }}-${{ steps.composer-cache-vars.outputs.timestamp }}