Bump justinrainbow/json-schema from 5.3.0 to 6.6.4

Bumps [justinrainbow/json-schema](https://github.com/jsonrainbow/json-schema) from 5.3.0 to 6.6.4.
- [Release notes](https://github.com/jsonrainbow/json-schema/releases)
- [Changelog](https://github.com/jsonrainbow/json-schema/blob/main/CHANGELOG.md)
- [Commits](jsonrainbow/json-schema@5.3.0...6.6.4)

---
updated-dependencies:
- dependency-name: justinrainbow/json-schema
  dependency-version: 6.6.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

composer.json

@@ -1,7 +1,7 @@
 {
     "require": {
         "php": ">=8.1",
-        "justinrainbow/json-schema": "^5.3",
+        "justinrainbow/json-schema": "^6.6",
         "php-parallel-lint/php-parallel-lint": "1.4",
         "phpstan/phpstan": "2.1.37",
         "phpstan/phpstan-deprecation-rules": "2.0.3",