refactor: replace sliceutil with slices.Chunk

[phm07]

See hetznercloud/hcloud-go#610

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.17%. Comparing base (926ff25) to head (97e11b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1006   +/-   ##
=======================================
  Coverage   70.17%   70.17%           
=======================================
  Files         245      245           
  Lines       10782    10782           
=======================================
  Hits         7566     7566           
  Misses       2539     2539           
  Partials      677      677           

Flag	Coverage Δ
e2e	46.92% <100.00%> (ø)
unit	63.63% <100.00%> (ø)

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