Update juliangut/easy-coding-standard-config requirement

Updates the requirements on [juliangut/easy-coding-standard-config](https://github.com/juliangut/easy-coding-standard-config) to permit the latest version.
- [Release notes](https://github.com/juliangut/easy-coding-standard-config/releases)
- [Commits](juliangut/easy-coding-standard-config@1.18...1.20)

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

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

composer.json

@@ -31,7 +31,7 @@
   },
   "require-dev": {
     "grifart/phpstan-oneline": "~0.4",
-    "juliangut/easy-coding-standard-config": "^1.18",
+    "juliangut/easy-coding-standard-config": "^1.20",
     "juliangut/phpstan-config": "^1.2",
     "overtrue/phplint": "^9.4",
     "phpcompatibility/php-compatibility": "^9.3",