Add support for WP 6.0 stubs (#108)

Author: ZebulanStanphill

composer.json

@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": "^7.2 || ^8.0",
-        "php-stubs/wordpress-stubs": "^4.7 || ^5.0",
+        "php-stubs/wordpress-stubs": "^4.7 || ^5.0 || ^6.0",
         "phpstan/phpstan": "^1.6",
         "symfony/polyfill-php73": "^1.12.0"
     },