Update php-enum dependency version to ^4.4

Hi,

Versions of `mark-mabe/php-enum` lower than 4.4 emit a warning on PHP 8:

```
PHP Warning: Private methods cannot be final as they are never overridden by other classes
```

so it would be nice to restrict installs to versions that work fine. There is no BC breaks with this and no change in dependencies.

Author: emodric

composer.json

@@ -29,7 +29,7 @@
     "require": {
         "php": "^7.2 || ^8.0",
         "ext-json": "*",
-        "marc-mabe/php-enum":"^4.0"
+        "marc-mabe/php-enum":"^4.4"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "3.3.0",