Update symplify/easy-coding-standard requirement from ^11.5 to ^12.1

Updates the requirements on [symplify/easy-coding-standard](https://github.com/easy-coding-standard/easy-coding-standard) to permit the latest version.
- [Release notes](https://github.com/easy-coding-standard/easy-coding-standard/releases)
- [Commits](easy-coding-standard/easy-coding-standard@11.5.0...12.1.1)

---
updated-dependencies:
- dependency-name: symplify/easy-coding-standard
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -37,7 +37,7 @@
     "phpstan/phpstan": "^1.10",
     "phpunit/phpunit": "^10.2",
     "rector/rector": "^0.17",
-    "symplify/easy-coding-standard": "^11.5"
+    "symplify/easy-coding-standard": "^12.1"
   },
   "autoload": {
     "psr-4": {