refactor(lib): merge files

[hasundue]

• refactor(lib): merge semver.ts into dependency.ts
• refactor(lib): merge loader.ts into update.ts
• refactor(lib): merge lib/versions.ts into lib/git.ts

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (d1ba3cf) 81.07% compared to head (6e5e462) 83.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   81.07%   83.05%   +1.97%     
==========================================
  Files          19       16       -3     
  Lines         613      590      -23     
  Branches       86       86              
==========================================
- Hits          497      490       -7     
+ Misses        116      100      -16     

Files	Coverage Δ
lib/git.ts	83.50% <100.00%> (ø)
lib/update.ts	86.30% <90.24%> (+10.44%)	⬆️
lib/dependency.ts	72.18% <70.58%> (-0.47%)	⬇️

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