Canary scenario should use latest version of recommendations container

[aknot242]

The canary scenario that purposefully creates errors relies on an old version of the recommendations container:

modern_app_jumpstart_workshop/docs/ingress/canary.md

Line 56 in ef6bc47

image: ghcr.io/f5devcentral/spa-demo-app-recommendations:sha-8123c6f

The recommendations container used in the scenario should be able to use the current version, with likely a switch to simulate the error condition. An environment variable perhaps?