Update justinrainbow/json-schema requirement from ^5.0 to ^6.0

Updates the requirements on [justinrainbow/json-schema](https://github.com/jsonrainbow/json-schema) to permit the latest version.
- [Release notes](https://github.com/jsonrainbow/json-schema/releases)
- [Changelog](https://github.com/jsonrainbow/json-schema/blob/master/CHANGELOG.md)
- [Commits](jsonrainbow/json-schema@5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: justinrainbow/json-schema
  dependency-type: direct:production
...

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

Author: dependabot[bot]

composer.json

@@ -11,7 +11,7 @@
     "require": {
         "php": "^8.0",
         "softcreatr/jsonpath": "^0.8",
-        "justinrainbow/json-schema": "^5.0"
+        "justinrainbow/json-schema": "^6.0"
     },
     "conflict": {
         "phpunit/phpunit": "<8.0 || >= 11.0"