Rename 'unused' variable with underscore prefix - variable is used to…

… intentionally raise and exception

tests/core/test_streams.py

@@ -292,7 +292,7 @@ class InvalidReplicationKeyStream(SimpleTestStream):
             f"{stream.replication_key} is not in schema for stream name: {stream.name}"
         ),
     ):
-        pass
+        _check = stream.is_timestamp_replication_key
 
 
 @pytest.mark.parametrize(