[Pkg-rust-maintainers] Bug#1042490: rust-assert-cmd: Please update to v2.0.10

[Peter Green]

> Please update to (at least) newer upstream release v2.0.10.


The new version of assert_cmd has switched to anstream instead of yansi,
the anstream crate is not currently in Debian. As I've said before I
don't like to package new things if they aren't personally important to me

The update also looks like it will bring with it a new version of the
predicates crate, but that doesn't seem to be a huge deal.

I've pushed my work in progress on this update to the "update-assert-cmd"
branch if anyone else wants to pick it up.