cli: update dependencies (#184189)

Up all the dependencies! Notably:

- russh to the latest main now that tunnel changes are merged
- secret-service-rs to 3.x and dropping our custom fork
- which also fixes SDL pings

Fixes https://github.com/microsoft/vscode-internalbacklog/issues/4328
Fixes https://github.com/microsoft/vscode-internalbacklog/issues/4077