fix: pprof

[discord9]

I hereby agree to the terms of the GreptimeDB CLA.

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What's changed and what's your intention?

previous due to lack of maintaince pprof crate is not usable in certain platform.

Fork and applied a fix which check for null pointer and update ahash crate which now fix pprof for my machine.

The fork is here: https://github.com/GreptimeTeam/pprof-rs

Before this fix, my machine panic on trying to pprof, now it can get a flamegraph(The db is basically idle when doing the pprof):

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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

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.88%. Comparing base (191755f) to head (55654a5).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4938      +/-   ##
==========================================
- Coverage   84.22%   83.88%   -0.35%     
==========================================
  Files        1137     1141       +4     
  Lines      210098   211208    +1110     
==========================================
+ Hits       176958   177164     +206     
- Misses      33140    34044     +904