Set minimum phpunit versions to 9.5

Author: tomzx

composer.json

@@ -30,7 +30,7 @@
 	},
 	"require-dev": {
 		"mockery/mockery": "^1.0",
-		"phpunit/phpunit": "^8.0|^9.0"
+		"phpunit/phpunit": "^9.5"
 	},
 	"bin": [
 		"bin/php-semver-checker"