Update php.yml

Author: slavvka

.github/workflows/php.yml

@@ -14,9 +14,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Validate composer.json and composer.lock
-      run: composer validate
-
     - name: Cache Composer packages
       id: composer-cache
       uses: actions/cache@v2