Introduce synckit for speed-up checkSync

[makenowjust]

Changes

• Introduce synckit for speed-up checkSync
  • See Better unsafe regex detector eslint-community/eslint-plugin-security#28 (comment)

[codecov-commenter]

Codecov Report

Merging #799 (5b7a104) into main (d2c07e8) will decrease coverage by 0.03%.
The diff coverage is 97.36%.

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@@            Coverage Diff             @@
##             main     #799      +/-   ##
==========================================
- Coverage   99.07%   99.05%   -0.03%     
==========================================
  Files          69       69              
  Lines        3037     3069      +32     
  Branches      509      516       +7     
==========================================
+ Hits         3009     3040      +31     
- Misses         28       29       +1     

Impacted Files	Coverage Δ
packages/recheck/src/lib/env.ts	94.44% <80.00%> (-5.56%)	⬇️
packages/recheck/src/lib/agent.ts	100.00% <100.00%> (ø)
packages/recheck/src/lib/exe.ts	100.00% <100.00%> (ø)
packages/recheck/src/main.ts	100.00% <100.00%> (ø)

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