Copy the value from slice to avoid the original value being modified

[ktong]

It has code to deep copy map but not slice. This PR also copies value for slice

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.8%. Comparing base (411ab81) to head (9b56adf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #572   +/-   ##
=====================================
  Coverage   82.7%   82.8%           
=====================================
  Files         62      62           
  Lines       3310    3319    +9     
=====================================
+ Hits        2740    2749    +9     
  Misses       485     485           
  Partials      85      85           

Files with missing lines	Coverage Δ
internal/convert/converter.go	99.3% <100.0%> (+<0.1%)	⬆️
internal/maps/transform.go	100.0% <100.0%> (ø)

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