Tests with setup-php@v2

Author: casperbakker

.github/workflows/phpunit.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Setup PHP
-      uses: shivammathur/setup-php@v1
+      uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php-versions }}
         extensions: mbstring, gd, bcmath, imagick