[*] fix TryDisposeSelf not from killTimer

[ZjzMisaka]

No description provided.

[ZjzMisaka]

self checked

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.

Project coverage is 99.87%. Comparing base (69d317d) to head (3591e19).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
PowerThreadPool/Core/Worker.cs	96.29%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   99.40%   99.87%   +0.46%     
==========================================
  Files          36       36              
  Lines        2355     2367      +12     
  Branches      291      291              
==========================================
+ Hits         2341     2364      +23     
+ Misses          8        2       -6     
+ Partials        6        1       -5     

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