fix: modtime

[caarlos0]

closes #757

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (29c8513) 74.92% compared to head (c03e737) 75.20%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
deb/deb.go	37.50%	1 Missing and 9 partials ⚠️
internal/modtime/mtime.go	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
+ Coverage   74.92%   75.20%   +0.27%     
==========================================
  Files          11       12       +1     
  Lines        2465     2468       +3     
==========================================
+ Hits         1847     1856       +9     
+ Misses        439      433       -6     
  Partials      179      179              

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