Adjust required PHPUnit requirements and CI setup

Author: stloyd

.github/workflows/CI.yaml

@@ -82,7 +82,7 @@ jobs:
           fi
 
       - name: "PHPUnit: tests"
-        run: vendor/bin/phpunit --testsuite=unit
+        run: vendor/bin/phpunit --no-coverage --testsuite=unit
 
   integration-tests:
     name: "Integration Tests (PHP ${{ matrix.php-version }} ${{ matrix.dependencies }})"