chore: add parallel_test case

tests/parallel_test/cases.task

@@ -191,6 +191,7 @@
 38,,script,./test.sh -f unique/arbitrator/sync_replica2_dropDb.sim
 38,,script,./test.sh -f general/table/delete_reuse2.sim
 38,,script,./test.sh -f general/insert/insert_drop.sim
+38,,script,./test.sh -f general/insert/insert_update2.sim
 37,,script,./test.sh -f unique/mnode/mgmt30.sim
 37,,script,./test.sh -f unique/column/replica3.sim
 37,,script,./test.sh -f unique/arbitrator/offline_replica2_createTable_online.sim