fix(bigquery): use correct attribute to check routine type

The BigQuery Python client exposes routine type as `type_` (not
`routine_type`), since `type` is a Python builtin. Using
`RoutineType.PROCEDURE` from the library's enum avoids hardcoding
the string "PROCEDURE".

Author: QMalcolm

dbt-bigquery/src/dbt/adapters/bigquery/impl.py

@@ -23,6 +23,7 @@
 import google.oauth2
 import google.cloud.bigquery
 from google.cloud.bigquery import AccessEntry, Client, SchemaField, Table as BigQueryTable
+from google.cloud.bigquery.routine import RoutineType
 import google.cloud.exceptions
 import pytz
 
@@ -589,7 +590,7 @@ def _bq_routine_to_relation(self, bq_routine) -> Union[BigQueryRelation, None]:
         if bq_routine is None:
             return None
 
-        if bq_routine.routine_type == "PROCEDURE":
+        if bq_routine.type_ == RoutineType.PROCEDURE:
             return None
 
         return self.Relation.create(