Also install PHPUnit when running levels tests

Author: ondrejmirtes

.github/workflows/tests.yml

@@ -154,6 +154,9 @@ jobs:
       - name: "Install dependencies"
         run: "composer install --no-interaction --no-progress"
 
+      - name: "Install PHPUnit 10.x"
+        run: "composer remove --dev brianium/paratest && composer require --dev --with-all-dependencies phpunit/phpunit:^10"
+
       - name: "Tests"
         run: "${{ matrix.script }}"