I originally noticed that the QR code flow didn't handle this error when investigating ENG-8113. That led to the further realization that the QR code flow hasn't been kept up-to-date, which was addressed in ENG-8123. This diff completes the circle and finally adds code to handle the outdated client error specifically.

Depends on D12116

I tested the web equivalent by hardcoding a failure in keyserver/src/session/version.js for all web clients