Update github actions-cache runner

Author: cooperaj

.github/workflows/php.yml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Cache Composer packages
         id: composer-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: vendor
           key: ${{ runner.os }}-php-${{ hashFiles('**/composer.json') }}