fix: fix timestamps on gen-genesis CLI

[glevco]

Motivation

There's a bug in the gen-genesis CLI tool where the timestamps are changed when the genesis weights are greater than zero.

Acceptance Criteria

• Set update_time=False on genesis generation.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.05%. Comparing base (716a012) to head (bda7fb0).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1094      +/-   ##
==========================================
- Coverage   85.11%   85.05%   -0.07%     
==========================================
  Files         314      314              
  Lines       23957    23957              
  Branches     3621     3621              
==========================================
- Hits        20392    20377      -15     
- Misses       2862     2872      +10     
- Partials      703      708       +5     

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