Improve progress bar update API

[mdekstrand]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 89.99%. Comparing base (4dbdbdd) to head (0ffd8b8).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lenskit/logging/progress/_notebook.py	0.00%	6 Missing ⚠️
src/lenskit/logging/progress/_rich.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #681      +/-   ##
==========================================
- Coverage   90.02%   89.99%   -0.03%     
==========================================
  Files         134      134              
  Lines        9299     9295       -4     
==========================================
- Hits         8371     8365       -6     
- Misses        928      930       +2     

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