Make setupTask Task<Void, Never>.

#526 (comment)

Author: CalebRas

Shared/Samples/List contents of KML file/ListContentsOfKMLFileView.swift

@@ -81,7 +81,7 @@ private extension ListContentsOfKMLFileView {
         }()
 
         /// The task used for the asynchronous setup operations.
-        private var setupTask: Task<Void, Error>?
+        private var setupTask: Task<Void, Never>?
 
         init() {
             setupTask = Task { [weak self] in