Replace jQuery.type() check with typeof

This method was deprecated in jQuery version 3.3, and removed from
jQuery as of version 4.0.0-beta.

  * https://api.jquery.com/category/deprecated/deprecated-3.3/
  * https://blog.jquery.com/2018/01/19/jquery-3-3-0-a-fragrant-bouquet-of-deprecations-and-is-that-a-new-feature/
  * https://blog.jquery.com/2024/02/06/jquery-4-0-0-beta/

Related to issue: #186 and #189

src/core.js

@@ -93,7 +93,7 @@ $.fn.powerTip = function(opts, arg) {
 	}
 
 	// handle api method calls on the plugin, e.g. powerTip('hide')
-	if ($.type(opts) === 'string' && $.powerTip[opts]) {
+	if (typeof opts === 'string' && $.powerTip[opts]) {
 		return $.powerTip[opts].call(targetElements, targetElements, arg);
 	}