[python/ci] Leave 3.12 support provisional

[johnkerl]

Issue and/or context:

• Issue [Feature request] Python 3.12 support #1849
• I put up PR [python] Support Python 3.12 #2108 and it was green so I merged it
• Now PRs [python] Outgest additional X layers to AnnData #2119 [python] Remove a temp comment, and complete Python 3.12 checks #2136 and anything else new is failing MacPS Python 3.12 CI fails
  • Unable to install wheel for pyarrow
  • https://github.com/single-cell-data/TileDB-SOMA/actions/runs/7896650237/job/21550972931?pr=2138 for example
• Another issue: TileDB-Py doesn't have wheels for 3.12
  • https://pypi.org/project/tiledb/#files

Changes:

• Leave 3.12 support in place -- don't entirely revert [Feature request] Python 3.12 support #1849
• Don't fail CI for 3.12 until the above is resolved
• Leave [Feature request] Python 3.12 support #1849 open for tracking

Notes for Reviewer:

[codecov]

Codecov Report

Merging #2140 (ee82219) into main (f2eb946) will decrease coverage by 6.64%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2140      +/-   ##
==========================================
- Coverage   78.40%   71.77%   -6.64%     
==========================================
  Files         136      101      -35     
  Lines       10708     6920    -3788     
  Branches      211      211              
==========================================
- Hits         8396     4967    -3429     
+ Misses       2210     1851     -359     
  Partials      102      102              

Flag	Coverage Δ
libtiledbsoma	66.97% <ø> (ø)
python	?
r	74.62% <ø> (ø)

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

Components	Coverage Δ
python_api	∅ <ø> (∅)
libtiledbsoma	48.34% <ø> (ø)