feat : deletion of an unnecessary step in CI

.github/workflows/php.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [ master ]
   pull_request:
+    branches: [ master ]
 
 jobs:
   build:
@@ -17,16 +18,12 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: Validate composer.json and composer.lock
-      run: composer validate
-
     - name: Set PHP version
       uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php }}
 
     - name: Install dependencies
-      if: steps.composer-cache.outputs.cache-hit != 'true'
       run: composer update --prefer-dist --no-progress --no-suggest
 
     - name: Execute PHPUnit