Remove optional return type on DataMapper

AppleLibs/Network/Requests/DataMapper.swift

@@ -11,5 +11,5 @@ import Foundation
 public protocol DataMapper
 {
     @available(iOS 15.0.0, *)
-    func mapData(data: Data?, response: URLResponse?, sender: Any?) async throws -> Any?
+    func mapData(data: Data?, response: URLResponse?, sender: Any?) async throws -> Any
 }