Fix linter

there have been some CI issues:

• the docker container was running an out of date rust version
• the time crate was out of date
• a little issue with a missing default implementation of the bandwidth counter

This MR fixes them, the docker container hosted on 0xacab has been updated separately now.

What remains is an unsused function pub fn bootstrap_done() -> Self. @ahf do you think it's save to delete it?