Update actions/cache action to v5

| datasource  | package       | from | to |
| ----------- | ------------- | ---- | -- |
| github-tags | actions/cache | v4   | v5 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build_test.yml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: vendor
           key: ${{ runner.os }}-php-${{matrix.php_version}}-${{ hashFiles('**/composer.lock') }}