Use Xdebug for coverage reports

Author: tvdijen

.github/workflows/php.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Setup PHP, with composer and extensions
         uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
         with:
-          coverage: pcov
+          coverage: debug
           extensions: intl, mbstring, xml
           ini-values: error_reporting=E_ALL
           php-version: ${{ matrix.php-versions }}