Port monty to new rng interface

[richfitz]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.52%. Comparing base (0ef8481) to head (511978c).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
- Coverage   99.54%   99.52%   -0.02%     
==========================================
  Files          73       73              
  Lines        5888     5891       +3     
==========================================
+ Hits         5861     5863       +2     
- Misses         27       28       +1     

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