chore: update snafu to make clippy happy

[MichaelScofield]

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?

In our another project which use greptimedb as a submodule, the snafu version is 0.8.4. However, the snafu version in greptimedb is 0.8.3. A commit in snafu in between the two versions makes clippy runs fail in that project. So this PR updates the snafu in greptimedb and resolve the clippy issues.

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 85.00%. Comparing base (8f0959f) to head (a88ec1b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4507      +/-   ##
==========================================
- Coverage   85.01%   85.00%   -0.01%     
==========================================
  Files        1084     1084              
  Lines      193947   193947              
==========================================
- Hits       164880   164863      -17     
- Misses      29067    29084      +17     

[fengjiachun]

LGTM

[fengjiachun]

CI failed again cc @MichaelScofield

[MichaelScofield]

@WenyXu PTAL