Support newer versions of nix and ratatui

[FedericoCeratto]

A small change to bump up dependency versions.

[tsowell]

Hi, thank you for this. If you don't mind, I have some other housekeeping changes I'd like to squash into your commit, like updating the lockfiles and bumping the MSVR.

A couple of thoughts on the changes:

We can't remove the EventFd::arm() calls because that's what was signaling that stuff is pending deletion. Replacing arm() with write(1) will preserve the existing behavior.

Also, I'd prefer caret requirements instead of >= in Cargo.toml. Do you have any objections to "0.31.3" for nix and "0.30.2" for ratatui? (I see that you maintain Debian's wiremix package, which I appreciate, so let me know what would make your life easier.)