version info gets outdated by upgrades

[dckc]

After upgrade-14 and upgrade-15, https://devnet.agoric.net/ still shows

Revision: 734e8635002e01b3e27477e93998dda942c7fae8
Docker Image: ghcr.io/agoric/agoric-sdk:43
Revision Link: https://github.com/Agoric/agoric-sdk/tree/734e8635002e01b3e27477e93998dda942c7fae8

Perhaps that should say something more like "Revision at Genesis: ..." with a note that upgrades, which can be seen on the explorer, may have occurred since.

cc @toliaqat