Downgrade ergebnis/composer-normalize (#428)

Author: kubawerlos

dev-tools/composer.json

@@ -3,7 +3,7 @@
  "php": "^7.4"
  },
  "require-dev": {
- "ergebnis/composer-normalize": "^2.11.0",
+ "ergebnis/composer-normalize": "^2.9.0",
  "infection/infection": "^0.20.1",
  "kubawerlos/php-cs-fixer-config": "^1.6.0",
  "kubawerlos/types-checker": "^2.0.0",