👽 use recommended API for assert_cmd

[ChanTsune]

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[gemini-code-assist]

Summary of Changes

Hello @ChanTsune, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the test suite to adopt the recommended API for the assert_cmd crate. By switching to the cargo_bin_cmd! macro, the tests now leverage a more idiomatic and potentially more robust way to execute cargo binaries, ensuring better alignment with the library's best practices.

Highlights

• assert_cmd API Update: Updated test files to use the cargo_bin_cmd! macro from the assert_cmd crate, replacing the older Command::cargo_bin().unwrap() pattern for spawning cargo binaries.

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[gemini-code-assist]

Code Review

This pull request updates the test file cli/tests/cli/stdio/unlink_first.rs to use the recommended cargo_bin_cmd! macro from the assert_cmd crate. This change replaces the previous Command::cargo_bin(...).unwrap() calls, leading to cleaner and more idiomatic test code. The update is implemented correctly and is a good improvement.