Remove symfony 6 hacks (#15)

Author: sidz

.github/workflows/ci.yaml

@@ -56,19 +56,13 @@ jobs:
       - name: Globally install symfony/flex
         run: composer global require --no-progress --no-scripts --no-plugins symfony/flex
 
-      - name: Configure Symfony v6@dev hacks
-        if: matrix.symfony-require == '^6'
-        run: |
-          composer config minimum-stability beta
-
       - name: Install dependencies
         run: composer update --optimize-autoloader --no-interaction --no-progress --prefer-dist
 
       - name: Run tests and generate coverage
         run: make test-unit
 
       - name: Upload coverage results to Coveralls
-        if: matrix.symfony-require != '^6'
         env:
           COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: vendor/bin/php-coveralls