Migrate to lighthouse-rust 4.0.0

[fwcd]

Ideally we shouldn't close it explicitly as we currently do:

limo/src/cmd/display.rs

Line 81 in 6504f77

ctx.lh.stop(&path.as_lh_vec()).await?;

...and instead rely on ProjectLighthouseCAU/lighthouse-rust#14

[fwcd]

We should also update this to the new user/<user>/input endpoint, as implemented in ProjectLighthouseCAU/lighthouse-rust#18, once version 4.0.0 of the lighthouse-client crate is released.