[Merged by Bors] - use zap in cmd/bootstrapper

[poszu]

Motivation

Part of the effort to migrate to zap.

Description

Test Plan

existing tests pass

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.1%. Comparing base (88ba729) to head (1792177).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6237   +/-   ##
=======================================
  Coverage     82.1%   82.1%           
=======================================
  Files          308     308           
  Lines        34066   34067    +1     
=======================================
+ Hits         27976   27982    +6     
+ Misses        4314    4310    -4     
+ Partials      1776    1775    -1     

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[poszu]

bors merge

[spacemesh-bors]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status