chore: remove extra import

Author: kjy5

Assets/Scripts/EphysLink/CommunicationManager.cs

@@ -2,7 +2,6 @@
 using System.Globalization;
 using System.IO;
 using System.Linq;
-using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Signers;
 using BestHTTP.SocketIO3;
 using UnityEngine;