Remove php-cs-fixer since it is not yet compatible with symfony 6

Author: W0rma

.github/workflows/continuous-integration.yml

@@ -79,6 +79,7 @@ jobs:
           SYMFONY_REQUIRE: "${{ matrix.symfony-require }}"
         run: |
           composer update --no-interaction --no-progress ${{ matrix.composer-flags }}
+          composer remove friendsofphp/php-cs-fixer --dev
 
       - name: "Run PHPUnit"
         if: "${{ matrix.coverage != '' }}"