chore(deps): update actions/cache action to v4 (#218)

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

.github/workflows/test-php.yml

@@ -43,7 +43,7 @@ jobs:
         working-directory: php
 
       - name: Cache composer
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: "${{ steps.composer-cache.outputs.dir }}"
           key: composer