Switch to math/rand/v2

[mhutchinson]

The new APIs allow for some cleanup in the common usages we have around uint64. The only downside is that this is go1.22+, but we've already committed to that in the go.mod file.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.37%. Comparing base (4ebea17) to head (7b194b6).
Report is 52 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
+ Coverage   89.33%   89.37%   +0.04%     
==========================================
  Files           7        7              
  Lines         497      499       +2     
==========================================
+ Hits          444      446       +2     
  Misses         48       48              
  Partials        5        5              

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