Upgrade PHPUnit with Paratest to speedup coverage generation

Author: staabm

.github/workflows/tests.yml

@@ -234,6 +234,10 @@ jobs:
         with:
           working-directory: "tests/"
 
+      - name: "Upgrade PHPUnit with Paratest to speedup coverage generation"
+        shell: bash
+        run: "composer require --dev phpunit/phpunit:^12 brianium/paratest --update-with-dependencies --ignore-platform-reqs --working-dir=tests"
+
       - uses: "ramsey/composer-install@v3"
         with:
           working-directory: "build-infection/"