refactor: refactor pidMap using sync.Map

[Tochemey]

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[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.50%. Comparing base (0e87775) to head (bb21d7f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
actors/pid.go	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
- Coverage   88.53%   88.50%   -0.03%     
==========================================
  Files          45       45              
  Lines        3514     3507       -7     
==========================================
- Hits         3111     3104       -7     
  Misses        289      289              
  Partials      114      114              

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