Clean up mocking code a bit

[skovhus]

... Rabbit hole after trying to upgrade chalk. jestjs/jest#12270

[codecov]

Codecov Report

Merging #275 (797dc3a) into main (ed93f32) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   92.29%   92.18%   -0.11%     
==========================================
  Files          26       26              
  Lines        1842     1842              
  Branches      381      381              
==========================================
- Hits         1700     1698       -2     
- Misses        101      102       +1     
- Partials       41       42       +1     

Impacted Files	Coverage Δ
src/utils/proxyquire.ts	88.13% <0.00%> (-3.39%)	⬇️

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