fix: process resources are not released

[k3rn31]

Fixed #65

[codecov]

Codecov Report

Merging #66 (ddcee98) into main (a19ff06) will decrease coverage by 0.26%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
- Coverage   86.65%   86.38%   -0.27%     
==========================================
  Files          10       10              
  Lines         562      573      +11     
==========================================
+ Hits          487      495       +8     
- Misses         59       61       +2     
- Partials       16       17       +1     

Flag	Coverage Δ
unittests	86.38% <75.00%> (-0.27%)	⬇️

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Impacted Files	Coverage Δ
pkg/mutator/mutator.go	85.45% <75.00%> (-0.91%)	⬇️

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