composer: require stable packages outside of nette

Author: dg

composer.json

@@ -23,7 +23,7 @@
 		"nette/di": "^3.1 || ^4.0",
 		"nette/tester": "^2.4",
 		"tracy/tracy": "^2.8",
-		"phpstan/phpstan-nette": "^1.0"
+		"phpstan/phpstan-nette": "^2.0@stable"
 	},
 	"suggest": {
 		"ext-fileinfo": "to detect type of attached files",