[wip] update minimun version of phpunit

Author: xico42

composer.json

@@ -31,7 +31,7 @@
     "widmogrod/php-functional": "^6.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^8.2.3|^9.4.2",
+    "phpunit/phpunit": "^9.5.10",
     "phpbench/phpbench": "1.0.0-alpha2",
     "vlucas/phpdotenv": "~2.4",
     "symfony/serializer": "^3.4|^4.3",