[BUGFIX] Ensure working phpunit version

Author: helhum

composer.json

@@ -21,7 +21,7 @@
         "symfony/polyfill-php80": "^1.23.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.5",
+        "phpunit/phpunit": "^8.5.36",
         "composer/composer": "^2.2",
         "php-parallel-lint/php-parallel-lint": "^1.2",
         "mikey179/vfsstream": "^1.6.10"