chore(deps-dev): update kahlan/kahlan requirement || ^6.0

Updates the requirements on [kahlan/kahlan](https://github.com/kahlan/kahlan) to permit the latest version.
- [Release notes](https://github.com/kahlan/kahlan/releases)
- [Changelog](https://github.com/kahlan/kahlan/blob/dev/CHANGELOG.md)
- [Commits](kahlan/kahlan@5.2.0...6.0.0)

---
updated-dependencies:
- dependency-name: kahlan/kahlan
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -21,7 +21,7 @@
     },
     "require-dev": {
         "blitz-php/coding-standard": "^1.3",
-        "kahlan/kahlan": "^5.2",
+        "kahlan/kahlan": "^5.2 || ^6.0",
         "phpstan/phpstan": "^1.4.7"
     },
     "autoload": {