Update actions/cache action to v5.0.5

| datasource  | package       | from   | to     |
| ----------- | ------------- | ------ | ------ |
| github-tags | actions/cache | v5.0.4 | v5.0.5 |

Author: renovate[bot]

.github/workflows/backwards-compatibility.yml

@@ -29,7 +29,7 @@ jobs:
         run: echo "composer_cache_dir=$(composer global config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: "Cache dependencies"
-        uses: "actions/cache@v5.0.4"
+        uses: "actions/cache@v5.0.5"
         with:
           path: ${{ steps.composer-cache.outputs.composer_cache_dir }}
           key: "php-8.3-bc-break-check-${{ hashFiles('.github/workflows/backwards-compatibility.yml') }}"