[python] Fix old pyarrow bug triggers

[XanthosXanthopoulos]

Issue and/or context: Fix varying dependency tests where latest pyarrow accepted code does not work on old versions o pyarrow

Changes:

Notes for Reviewer:

[jp-dark]

Link to varying dependency manual run: https://github.com/single-cell-data/TileDB-SOMA/actions/runs/23200704942

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.42%. Comparing base (a60c8f1) to head (128d5e2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4433      +/-   ##
==========================================
- Coverage   85.43%   85.42%   -0.02%     
==========================================
  Files         136      136              
  Lines       21437    21441       +4     
==========================================
+ Hits        18314    18315       +1     
- Misses       3123     3126       +3     

Flag	Coverage Δ
python	88.35% <75.00%> (-0.04%)	⬇️

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

Components	Coverage Δ
python_api	88.35% <75.00%> (-0.04%)	⬇️
libtiledbsoma	∅ <ø> (∅)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.