also allow phpstan extensions ^2

Author: sasezaki

composer.json

@@ -14,8 +14,8 @@
     "require-dev": {
         "laminas/laminas-coding-standard": "^2.0.0",
         "maglnet/composer-require-checker": "^2|^3|^4",
-        "phpstan/phpstan-phpunit": "^1.3",
-        "phpstan/phpstan-strict-rules": "^1.5",
+        "phpstan/phpstan-phpunit": "^1.3 || ^2.0",
+        "phpstan/phpstan-strict-rules": "^1.5 || ^2.0",
         "phpunit/phpunit": "^8.5.31 || ^9.5.10 || ^10.5.35",
         "roave/security-advisories": "dev-master",
         "squizlabs/php_codesniffer": "^3.7",