Remove use of atty crate

[SteveL-MSFT]

PR Summary

Remove use of atty crate, update version of crossterm

[Copilot]

Pull Request Overview

This PR removes the dependency on the atty crate and migrates to using crossterm's built-in TTY detection functionality, while also updating crossterm to version 0.29.

• Remove atty crate dependency from two Cargo.toml files
• Update crossterm from versions 0.26/0.27 to 0.29
• Replace atty::is(Stream::Stdin) with crossterm::event::is_tty(Stream::Stdin)

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
sshdconfig/Cargo.toml	Remove atty dependency and update crossterm to 0.29
archive/registry/src/main.rs	Replace atty usage with crossterm's is_tty function
archive/registry/Cargo.toml	Remove atty dependency and update crossterm to 0.29