convert n_file_expected to int

csst_dag/dag/_dispatcher.py

@@ -511,7 +511,7 @@ class Dispatcher:
                     this_data_obsid_file["detector"]
                 )
 
-            n_file_expected = this_data_obsid_plan["n_frame"].sum()
+            n_file_expected = int(this_data_obsid_plan["n_frame"].sum())
             n_file_found = len(this_data_obsid_file)
             # set n_file_expected and n_file_found
             this_task["n_file_expected"] = n_file_expected
@@ -612,7 +612,7 @@ class Dispatcher:
                         this_obsgroup_obsid_file["detector"]
                     )
 
-            n_file_expected = this_obsgroup_plan["n_frame"].sum()
+            n_file_expected = int(this_obsgroup_plan["n_frame"].sum())
             n_file_found = len(this_obsgroup_file)
             # set n_file_expected and n_file_found
             this_task["n_file_expected"] = n_file_expected