Remove seletize dependency

Seletize dependency is not compatibl with bootstrap 5

Author: Eseperio

composer.json

@@ -41,7 +41,6 @@
     "prefer-stable": true,
     "require": {
         "php": ">=5.5",
-        "2amigos/yii2-selectize-widget": "^1.1",
         "yiisoft/yii2-authclient": "^2.1",
         "yiisoft/yii2-httpclient": "^2.0",
         "yiisoft/yii2-bootstrap": "^2.0",