composer(deps-dev): update mimmi20/coding-standard requirement (#213)

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@2.2.0...2.2.2)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -24,7 +24,7 @@
   },
   "require-dev": {
     "infection/infection": "^0.22.1",
-    "mimmi20/coding-standard": "^2.2.0",
+    "mimmi20/coding-standard": "^2.2.2",
     "mimmi20/json-class": "^3.0.2",
     "pepakriz/phpstan-exception-rules": "^0.11.7",
     "phpstan/extension-installer": "^1.1.0",