Downgrade the ergebnis rules.

Author: johnbillion

composer.json

@@ -19,7 +19,7 @@
 		"php": ">=7.4"
 	},
 	"require-dev": {
-		"ergebnis/phpstan-rules": "2.2.0",
+		"ergebnis/phpstan-rules": "1.0.0",
 		"humanmade/coding-standards": "^1.1",
 		"phpcompatibility/php-compatibility": "9.3.5",
 		"phpstan/phpstan": "1.12.2",