Bump Dagster to v1.9.4, lib v0.25.4

[darrylng]

Summary

Bumping the docker.io/dagster/user-code-example version to the latest to match version bump for Dagster to v1.9.4
https://hub.docker.com/r/dagster/user-code-example/tags

Test Plan

This is Dagster's provided docker container. I ran docker build -t test-user-code-example . successfully.

Checklist

• No images hosted from dockerhub
• Are dashboards present to understand the health of the application. There must be at least 1 of these
  • all databases should have dashboards
  • ideally also have at least cpu/mem utilization dashboards for webserver tier of the app
  • you can use plural from-grafana to convert a grafana dashboard found via google to our CRD
• Are scaling runbooks present
  • all databases must have scaling runbooks
  • you can use the charts in pluralsh/module-library to accelerate this
• do you need to add config overlays?
  • inputing secrets
  • configuring autoscaling
• If there’s a web-facing component to the app, we need to support OIDC authentication and setting up private networks if no authentication option is viable
• All major clouds must be supported
  • Azure
  • AWS
  • GCP