Use ConcurrentUtils API

[tkf]

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[codecov]

Codecov Report

Merging #5 (4add740) into main (09fe663) will decrease coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
- Coverage   95.55%   95.40%   -0.16%     
==========================================
  Files           2        2              
  Lines          90       87       -3     
==========================================
- Hits           86       83       -3     
  Misses          4        4              

Flag	Coverage Δ
Pkg.test	95.40% <100.00%> (-0.16%)	⬇️

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Impacted Files	Coverage Δ
src/utils.jl	100.00% <ø> (ø)
src/core.jl	95.34% <100.00%> (ø)

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