Require at least numpyro 0.15.3

[damonbayer]

Closes #450

[dylanhmorris]

LGTM!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.40%. Comparing base (6e9fd3f) to head (eda4e37).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #453   +/-   ##
=======================================
  Coverage   94.40%   94.40%           
=======================================
  Files          42       42           
  Lines        1001     1001           
=======================================
  Hits          945      945           
  Misses         56       56           

Flag	Coverage Δ
unittests	94.40% <ø> (ø)

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