Merge pull request #227 from CleverTap/bugfix/SDK-5352/CleverTap-Unity-Integration

Update UnityNativeRequest.cs

Author: SuriyaKannimuthu

CleverTap/Runtime/Native/UnityNativeWrapper/Models/UnityNativeRequest.cs

@@ -1,6 +1,9 @@
 #if (!UNITY_IOS && !UNITY_ANDROID) || UNITY_EDITOR
 using System;
 using System.Collections.Generic;
+#if !UNITY_2022_1_OR_NEWER
+using System.Text;
+#endif
 using CleverTapSDK.Utilities;
 using UnityEngine.Networking;