Fix LTS compat tests

[ivirshup]

LTS compatibility tests have been failing for the past four months. I believe this is mostly due to uninstallable dependencies for old very old versions of the package.

Checking here: https://github.com/chanzuckerberg/cellxgene-census/actions/runs/12661005585

Run with:

gh workflow run lts-compat-check.yml --ref ivirshup/fix-lts-compat-tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.35%. Comparing base (aa51fcb) to head (d5e69be).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1326   +/-   ##
=======================================
  Coverage   91.35%   91.35%           
=======================================
  Files          82       82           
  Lines        6480     6480           
=======================================
  Hits         5920     5920           
  Misses        560      560           

Flag	Coverage Δ
unittests	91.35% <ø> (ø)

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