Use composer audit instead of third party security checker

Author: tvdijen

.github/workflows/php.yml

@@ -115,13 +115,13 @@ jobs:
         run: composer install --no-progress --prefer-dist --optimize-autoloader
 
       - name: Security check for locked dependencies
-        uses: symfonycorp/security-checker-action@v3
+        run: composer audit
 
       - name: Update Composer dependencies
         run: composer update --no-progress --prefer-dist --optimize-autoloader
 
       - name: Security check for updated dependencies
-        uses: symfonycorp/security-checker-action@v3
+        run: composer audit
 
   sanity-check:
     name: Sanity checks