Pin torchdata + fix some typing errors

[ivirshup]

This has ended up being a bit of a grab bag targeting some CI issues that have come up over the past couple weeks.

• Pin torchdata to a version that has datapipes
• Fix a number of mypy issues, mostly having to do with numpy typing thinking that operations might change the floating point type. A few of these are around us changing re-assigning a variable with a reshaped version.
• Fix a test that was prematurely closing a tiledbsoma object, which was then re-used in later tests. This probably should have been failing before, so something must have been fixed in tiledbsoma.

[ivirshup]

Hmm. Seems like I may have triggered some segfaults. I will try splitting this out a bit.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.35%. Comparing base (f32c274) to head (db43e76).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...us/src/cellxgene_census/experimental/pp/_online.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1325      +/-   ##
==========================================
- Coverage   91.36%   91.35%   -0.01%     
==========================================
  Files          82       82              
  Lines        6482     6480       -2     
==========================================
- Hits         5922     5920       -2     
  Misses        560      560              

Flag	Coverage Δ
unittests	91.35% <83.33%> (-0.01%)	⬇️

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