Update shivammathur/setup-php workflow (#96)

Author: staabm

.github/workflows/csfix.yml

@@ -18,7 +18,7 @@ jobs:
         ref: ${{ github.head_ref }}
 
     - name: Setup PHP
-      uses: shivammathur/setup-php@v1
+      uses: shivammathur/setup-php@v2
       with:
         php-version: 7.0
         coverage: none # disable xdebug, pcov