composer(deps-dev): update mimmi20/coding-standard requirement

Updates the requirements on [mimmi20/coding-standard](https://github.com/mimmi20/coding-standard) to permit the latest version.
- [Release notes](https://github.com/mimmi20/coding-standard/releases)
- [Commits](mimmi20/coding-standard@6.0.27...6.0.28)

---
updated-dependencies:
- dependency-name: mimmi20/coding-standard
  dependency-version: 6.0.28
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -41,7 +41,7 @@
     "ext-xmlwriter": "*",
     "infection/infection": "^0.29.14",
     "laminas/laminas-servicemanager": "^4.4.0",
-    "mimmi20/coding-standard": "^6.0.27",
+    "mimmi20/coding-standard": "^6.0.28",
     "nikic/php-parser": "^5.4.0",
     "phpstan/extension-installer": "^1.4.3",
     "phpstan/phpstan": "^2.1.13",