remove stacking of -c flag for coverage command

Author: Art4

.github/workflows/tests.yml

@@ -121,7 +121,7 @@ jobs:
 
       - name: Run tests with coverage-clover
         if: ${{ matrix.tool == 'code-coverage' }}
-        run: composer run phpunit -- -c tests/phpunit-coverage.dist.xml --coverage-clover .phpunit.cache/clover.xml
+        run: vendor/bin/phpunit -c tests/phpunit-coverage.dist.xml --coverage-clover .phpunit.cache/clover.xml
 
       - name: Upload coverage reports to Codecov
         if: ${{ matrix.tool == 'code-coverage' }}