Update symplify/easy-coding-standard requirement from ^11.0 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@11.0.1...12.1.8)

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

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -40,7 +40,7 @@
     "jangregor/phpstan-prophecy": "^1.0",
     "phpstan/extension-installer": "^1.1",
     "saschaegerer/phpstan-typo3": "^1.8.0",
-    "symplify/easy-coding-standard": "^11.0",
+    "symplify/easy-coding-standard": "^12.1",
     "phpstan/phpstan-strict-rules": "^1.4.4",
     "typo3/cms-rte-ckeditor": "^10.4 || ^11.5 || ^12.4"
   },