chore: remove unused rexpect dev-dependency

[fengys1996]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

This pr remove unused rexpect dev-dependency.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

[gemini-code-assist]

Summary of Changes

Hello, 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 focuses on optimizing the project's dependency tree by eliminating an identified unused development dependency, rexpect. This cleanup helps reduce build times, decrease the overall project footprint, and maintain a leaner, more efficient dependency graph.

Highlights

• Dependency Removal: The unused rexpect development dependency has been completely removed from the project's dependencies.

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[gemini-code-assist]

Code Review

This pull request removes the rexpect crate and its associated dependencies, including comma, nix (version 0.25.1), and memoffset (version 0.6.5), from the project. This is reflected in both src/cmd/Cargo.toml, where rexpect is removed as a dev-dependency, and Cargo.lock, which updates to remove the package definitions and adjust dependency references accordingly. There is no feedback to provide.

[fengjiachun]

LGTM