okay to merge rekados-rust-queue branch?

[Ricardo Wurmus]

Hi Guix,

I have a small branch with minor Rust package upgrades.  I successfully
built icecat on that branch and the failing rust-* packages seen in the
latest builds at https://ci.guix.gnu.org/jobset/rekados-rust-queue seem
to be broken on the master branch as well.

Would it be okay to merge this branch?

I’m asking because the cargo-build-system makes it difficult to see how
upgrades affect other packages, so building things on ci.guix.gnu.org
and locally is the only way I can verify that the changes aren’t
catastrophic.

I’d like to merge this soon while the successful builds are fresh.

-- 
Ricardo