[python] Use somacore 1.0.16

[johnkerl]

#2141
sc-41048

[johnkerl]

Weird that CI isn't finding somacore 1.0.16 b/c https://pypi.org/project/somacore/1.0.16/#files definitely exists (> 30 minutes now) ...

And I ran pip install somacore==1.0.16 successfully on my laptop just now ... 🤔

[johnkerl]

Derp, PEBKAC :) -- needs #3021

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 89.94%. Comparing base (d1f401d) to head (d09a911).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3035      +/-   ##
==========================================
+ Coverage   89.64%   89.94%   +0.29%     
==========================================
  Files          40       41       +1     
  Lines        4096     4107      +11     
==========================================
+ Hits         3672     3694      +22     
+ Misses        424      413      -11     

Flag	Coverage Δ
python	89.94% <57.14%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
python_api	89.94% <57.14%> (+0.29%)	⬆️
libtiledbsoma	∅ <ø> (∅)