update minimum phpunit version

Sergiy Petrov · Sergiy Petrov · commit 9f049ee178a5 · 2021-10-14T12:53:04.000+03:00
diff --git a/composer.json b/composer.json
@@ -28,7 +28,7 @@
     },
     "require-dev": {
         "mockery/mockery": "^1.3",
-        "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+        "phpunit/phpunit": "^7.0 || ^8.5.21 || ^9.0"
     },
     "autoload": {
         "psr-4": {
