[python] Bump tiledbsoma version to 1.12.3

[ivirshup]

Bump tiledbsoma dep to 1.12.3.

I believe the remaining deprecations being thrown are actually coming from tiledbsoma, since this PR removes all use of tiledb_ctx.

[ivirshup]

@ebezzi were there other checks you wanted to run before bumping this?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.26%. Comparing base (55d0856) to head (5dc7b23).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1235      +/-   ##
==========================================
+ Coverage   91.18%   91.26%   +0.08%     
==========================================
  Files          80       80              
  Lines        6327     6329       +2     
==========================================
+ Hits         5769     5776       +7     
+ Misses        558      553       -5     

Flag	Coverage Δ
unittests	91.26% <100.00%> (+0.08%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.