fix(alerts): fixed a test bug

The test test_percolate_document_on_ingestion was relying on a typing bug.  When
creating the RECAPDocument rd_2, it was correctly setting the document_number
to a string, "1".  However, when it changed the value to trigger a webhook, it
set the value to the integer 1.  This worked because 1 != "1", even though
Django converts it later to a string and the result in the database is the
same.

Author: florean

cl/alerts/tests/tests_recap_alerts.py

@@ -3437,7 +3437,7 @@ def test_percolate_document_on_ingestion(self, mock_prefix) -> None:
             ),
             self.captureOnCommitCallbacks(execute=True),
         ):
-            rd_2.document_number = "1"
+            rd_2.document_number = "2"
             rd_2.save()
 
         call_command("cl_send_rt_percolator_alerts", testing_mode=True)