chore: remove unused dep

[shuiyisong]

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?

Remove unused dependencies using cargo udeps --workspace --all-targets --all-features.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.80%. Comparing base (bef6896) to head (980dbdf).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5163      +/-   ##
==========================================
- Coverage   84.04%   83.80%   -0.24%     
==========================================
  Files        1172     1172              
  Lines      218490   218490              
==========================================
- Hits       183620   183100     -520     
- Misses      34870    35390     +520