Raise minimum level php enum (#766)

* build: raise minimum level of marc-mabe/php-enum

* docs: add changelog entry

Author: DannyvdSluijs

CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add visibility modifiers to class constants ([#757](https://github.com/jsonrainbow/json-schema/pull/757))
 - Include PHP 8.4 in workflow ([#765](https://github.com/jsonrainbow/json-schema/pull/765))
 - Add `strict_types=1` to all classes in ./src ([#758](https://github.com/jsonrainbow/json-schema/pull/758))
+- Raise minimum level of marc-mabe/php-enum ([#766](https://github.com/jsonrainbow/json-schema/pull/766))
 
 ## [6.0.0] - 2024-07-30
 ### Added

composer.json

@@ -29,7 +29,7 @@
     "require": {
         "php": "^7.2 || ^8.0",
         "ext-json": "*",
-        "marc-mabe/php-enum":"^2.0 || ^3.0 || ^4.0",
+        "marc-mabe/php-enum":"^4.0",
         "icecave/parity": "^3.0"
     },
     "require-dev": {