chore(deps-dev): update codeigniter/coding-standard requirement || 1.8.*

Updates the requirements on [codeigniter/coding-standard](https://github.com/CodeIgniter/coding-standard) to permit the latest version.
- [Release notes](https://github.com/CodeIgniter/coding-standard/releases)
- [Changelog](https://github.com/CodeIgniter/coding-standard/blob/develop/CHANGELOG.md)
- [Commits](CodeIgniter/coding-standard@v1.7.0...v1.8.3)

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

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

composer.json

@@ -29,7 +29,7 @@
         "codeigniter4/settings": "^2.1"
     },
     "require-dev": {
-        "codeigniter/coding-standard": "1.7.*",
+        "codeigniter/coding-standard": "1.7.* || 1.8.*",
         "codeigniter/phpstan-codeigniter": "^1.3",
         "codeigniter4/devkit": "^1.0",
         "codeigniter4/framework": ">=4.3.5 <4.5.0 || ^4.5.1",