chore: update frontend/appflowy_flutter/lib/workspace/presentation/home/menu/sidebar/workspace/_sidebar_workspace_actions.dart

Co-authored-by: Lucas <lucas.xu@appflowy.io>

Author: richardshiue

frontend/appflowy_flutter/lib/workspace/presentation/home/menu/sidebar/workspace/_sidebar_workspace_actions.dart

@@ -100,7 +100,7 @@ class _WorkspaceMoreActionWrapper extends CustomActionCell {
 
   final WorkspaceMoreAction inner;
   final UserWorkspacePB workspace;
-  final void Function() closeWorkspaceMenu;
+  final VoidCallback closeWorkspaceMenu;
 
   @override
   Widget buildWithContext(