Fix build issue on swift 5.5

Author: Kyle-Ye

MenuHelperExtension/FinderSync.swift

@@ -22,11 +22,15 @@ class FinderSync: FIFinderSync {
         logger.notice("FinderSync() launched from \(Bundle.main.bundlePath, privacy: .public)")
         FIFinderSyncController.default().directoryURLs = Set(folderStore.syncItems.map { URL(fileURLWithPath: $0.path) })
         logger.notice("Init sync directory is \(folderStore.syncItems.map(\.path).joined(separator: "\n"), privacy: .public)")
-        
+
         // Monitor volumes
         NSWorkspace.shared.notificationCenter.addObserver(forName: NSWorkspace.didMountNotification, object: nil, queue: .main) { notification in
             if let volumeURL = notification.userInfo?[NSWorkspace.volumeURLUserInfoKey] as? URL {
-                folderStore.appendItem(SyncFolderItem(volumeURL))
+                Task {
+                    await MainActor.run {
+                        folderStore.appendItem(SyncFolderItem(volumeURL))
+                    }
+                }
             }
         }
     }