composer: require stable packages outside of nette

Author: dg

composer.json

@@ -20,8 +20,8 @@
 	"require-dev": {
 		"nette/tester": "^2.5",
 		"tracy/tracy": "^2.9",
-		"phpstan/phpstan": "^1.0",
-		"jetbrains/phpstorm-attributes": "dev-master"
+		"phpstan/phpstan-nette": "^2.0@stable",
+		"jetbrains/phpstorm-attributes": "^1.2"
 	},
 	"conflict": {
 		"nette/finder": "<3",