chore(deps): widen phpstan/phpstan requirement to ^1.10 || ^2.0

Allow PHPStan 2.x alongside 1.x to stay current with upstream releases.

Closes #2

Author: geekmuse

composer.json

@@ -13,7 +13,7 @@
         "php": ">=8.2"
     },
     "require-dev": {
-        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan": "^1.10 || ^2.0",
         "phpunit/phpunit": "^11.0"
     },
     "autoload": {