chore(deps-dev): update kint-php/kint requirement from ^5.0.4 to ^6.0

Updates the requirements on [kint-php/kint](https://github.com/kint-php/kint) to permit the latest version.
- [Release notes](https://github.com/kint-php/kint/releases)
- [Commits](kint-php/kint@5.0.4...6.0)

---
updated-dependencies:
- dependency-name: kint-php/kint
  dependency-type: direct:development
...

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

composer.json

@@ -19,7 +19,7 @@
     "require-dev": {
         "codeigniter/phpstan-codeigniter": "^1.4",
         "fakerphp/faker": "^1.9",
-        "kint-php/kint": "^5.0.4",
+        "kint-php/kint": "^6.0",
         "mikey179/vfsstream": "^1.6",
         "nexusphp/tachycardia": "^2.0",
         "phpstan/extension-installer": "^1.4",