fix(deps): update rust crate which to 4.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
which	dependencies	minor	4.1 -> 4.2

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[codecov]

Codecov Report

Merging #89 (d89d1a2) into main (f6fdba9) will decrease coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
- Coverage   94.12%   93.85%   -0.27%     
==========================================
  Files          28       28              
  Lines        1888     1888              
==========================================
- Hits         1777     1772       -5     
- Misses        111      116       +5     

Impacted Files	Coverage Δ
src/checkers/history/last_paths.rs	95.19% <0.00%> (-3.85%)	⬇️
src/config/builder/envtrie.rs	90.00% <0.00%> (-0.44%)	⬇️

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