chore(helm): update pipeline db version (#359)

Because

- the pipeline db version has been updated

This commit

- update pipeline db version

charts/vdp/values.yaml

@@ -73,7 +73,7 @@ pipelineBackend:
   # -- The path of configuration file for pipeline-backend
   configPath: /pipeline-backend/config/config.yaml
   # -- The database migration version
-  dbVersion: 4
+  dbVersion: 5
   # -- workflow setting
   workflow:
     maxWorkflowTimeout: 3600 # in seconds