Update php.yml

.github/workflows/php.yml

@@ -20,23 +20,11 @@ jobs:
       env:
           PHP_VERSION: ${{ matrix.php }}
       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
-        with:
-          path: vendor
-          php-version: '5.6'
-          key: ${{ matrix.os }}-php-${{ hashFiles('**/composer.lock') }}
-          restore-keys: |
-            ${{ matrix.os }}-php-
-
       - name: Install dependencies
-        if: steps.composer-cache.outputs.cache-hit != 'true'
         run: composer install --prefer-dist --no-progress --no-suggest
 
       # Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"