use ECS stable

Author: TomasVotruba

composer.json

@@ -9,7 +9,7 @@
         "symplify/rule-doc-generator-contracts": "^11.1"
     },
     "require-dev": {
-        "symplify/easy-coding-standard": "dev-main",
+        "symplify/easy-coding-standard": "^12.0.0",
         "squizlabs/php_codesniffer": "^3.7.2",
         "phpunit/phpunit": "^10.2",
         "symplify/rule-doc-generator": "^11.1",