Make mypy happy.

sage_validation/file_validator/forms.py

@@ -152,7 +152,7 @@ class CSVUploadForm(forms.Form):
 
         account_code_map = {
             obj.pl_account_code: obj.pl_account_name
-            for obj in PlAccountCodes.objects.using("meo").all()
+            for obj in PlAccountCodes.objects.using("meo").all()  # type: ignore[attr-defined]
         }
 
         for index, row in enumerate(data, start=1):