fix compile on rust 1.83.0

[loongs-zhang]

Fixes #354

Make sure that:

• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.39%. Comparing base (fdeb2c4) to head (53536ef).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
core/src/co_pool/mod.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
+ Coverage   71.09%   71.39%   +0.29%     
==========================================
  Files          68       68              
  Lines        5363     5363              
==========================================
+ Hits         3813     3829      +16     
+ Misses       1550     1534      -16     

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