fixed phpunit version

Author: astepin

composer.json

@@ -47,7 +47,7 @@
     "php-http/message": "^1.10"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.5.5",
+    "phpunit/phpunit": "^9.5.5,<=10.0",
     "phpstan/phpstan": "^1.0.0",
     "vimeo/psalm": "^5.1",
     "guzzlehttp/guzzle": "^7.2",