Upgrade package to v4.9.0 (#180)

Author: sierpinskid

Assets/Plugins/StreamChat/Changelog.txt

@@ -1,3 +1,7 @@
+v4.9.0:
+Fixes:
+* Fix compiler errors after switching to WebGL platform
+
 v4.8.0:
 Features:
 * Add method to get the current state of the unread counts with IStreamChatClient.GetLatestUnreadCountsAsync() -> this method also works when the client is disconnected. The unread counts state provides a detailed information about unread messages in each channel and thread.

Assets/Plugins/StreamChat/Core/LowLevelClient/StreamChatLowLevelClient.cs

@@ -206,7 +206,7 @@ private set
         /// <summary>
         /// SDK Version number
         /// </summary>
-        public static readonly Version SDKVersion = new Version(4, 8, 0);
+        public static readonly Version SDKVersion = new Version(4, 9, 0);
 
         /// <summary>
         /// Use this method to create the main client instance or use StreamChatClient constructor to create a client instance with custom dependencies