Fix TestKit backend

Author: robsdedude

neo4j/_async/io/_pool.py

@@ -565,7 +565,8 @@ async def _update_routing_table_from(
         return False
 
     async def update_routing_table(
-        self, *, database, imp_user, bookmarks, timeout, database_callback=None
+        self, *, database, imp_user, bookmarks, timeout=None,
+        database_callback=None
     ):
         """ Update the routing table from the first router able to provide
         valid routing information.

neo4j/_sync/io/_pool.py

@@ -565,7 +565,8 @@ def _update_routing_table_from(
         return False
 
     def update_routing_table(
-        self, *, database, imp_user, bookmarks, timeout, database_callback=None
+        self, *, database, imp_user, bookmarks, timeout=None,
+        database_callback=None
     ):
         """ Update the routing table from the first router able to provide
         valid routing information.