miri-script: Update dependencies, especially 'watch'

[neuschaefer]

Update (some of) the dependencies of the miri-script crate. The main motivation is to get rid of the slightly outdated version 0.38.44 of rustix.

I don't know if such an update is a good approach; please let me know.

[rustbot]

r? @Mark-Simulacrum

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[rustbot]

The Miri subtree was changed

cc @rust-lang/miri

[Gelbpunkt]

This shouldn't be necessary with rust-lang/miri@12307bd and rust-lang/miri@e1d77bc, which should be included in the next miri subtree update

[neuschaefer]

PR is obsolete

[RalfJung]

Generally Miri-only updates should be sent to https://github.com/rust-lang/miri/ -- that you would also have noticed that watch is gone there :)