Update symplify/easy-coding-standard requirement || ^12.0.0

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@v9.3.15...12.3.1)

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

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

composer.json

@@ -29,7 +29,7 @@
   "require-dev": {
     "umbrellio/code-style-php": "^1.0",
     "orchestra/testbench": "^9.0",
-    "symplify/easy-coding-standard":  "^9.3.15",
+    "symplify/easy-coding-standard":  "^9.3.15 || ^12.0.0",
     "php-coveralls/php-coveralls": "^2.1"
   },
   "scripts": {