Use faster pcov instead of xdebug

Author: tvdijen

.github/workflows/php.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Setup PHP, with composer and extensions
         uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
         with:
-          coverage: debug
+          coverage: pcov
           extensions: intl, mbstring, xml
           ini-values: error_reporting=E_ALL
           php-version: ${{ matrix.php-versions }}