fix: Avoid concurrent TODO updates (#26593)

(cherry picked from commit e43205e)

Co-authored-by: Ankush Menat <ankush@frappe.io>

frappe/desk/doctype/todo/todo.py

@@ -67,15 +67,17 @@ def update_in_reference(self):
 			return
 
 		try:
-			assignments = frappe.get_all(
+			assignments = frappe.db.get_values(
 				"ToDo",
-				filters={
+				{
 					"reference_type": self.reference_type,
 					"reference_name": self.reference_name,
 					"status": ("not in", ("Cancelled", "Closed")),
 					"allocated_to": ("is", "set"),
 				},
-				pluck="allocated_to",
+				"allocated_to",
+				pluck=True,
+				for_update=True,
 			)
 			assignments.reverse()