chore(pipeline): bump db version (#1104)

Because

- instill-ai/pipeline-backend#661 adds a new
pipeline migration.

This commit

- Bump pipeline DB version.

charts/core/values.yaml

@@ -388,7 +388,7 @@ pipelineBackend:
   # -- The path of configuration file for pipeline-backend
   configPath: /pipeline-backend/config/config.yaml
   # -- The database migration version
-  dbVersion: 27
+  dbVersion: 28
   # -- workflow setting
   workflow:
     maxWorkflowTimeout: 3600 # in seconds