Update PHPStan

Author: dktapps

composer.json

@@ -8,11 +8,11 @@
 		"php-64bit": "*"
 	},
 	"require-dev": {
-		"phpstan/phpstan": "~1.10.3",
+		"phpstan/phpstan": "2.1.0",
 		"phpstan/extension-installer": "^1.0",
-		"phpstan/phpstan-strict-rules": "^1.0.0",
+		"phpstan/phpstan-strict-rules": "^2.0.0",
 		"phpunit/phpunit": "^9.5 || ^10.0 || ^11.0",
-		"phpstan/phpstan-phpunit": "^1.0"
+		"phpstan/phpstan-phpunit": "^2.0"
 	},
 	"autoload": {
 		"psr-4": {