[python] Fix some warnings at anndata==0.11

[johnkerl]

Follow-on to #3305

Unfortunately, I still see these which appear to be outside of our control:

>>> import scanpy
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_csv from `anndata` is deprecated. Import anndata.io.read_csv instead.
  warnings.warn(msg, FutureWarning)
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_excel from `anndata` is deprecated. Import anndata.io.read_excel instead.
  warnings.warn(msg, FutureWarning)
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_hdf from `anndata` is deprecated. Import anndata.io.read_hdf instead.
  warnings.warn(msg, FutureWarning)
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_loom from `anndata` is deprecated. Import anndata.io.read_loom instead.
  warnings.warn(msg, FutureWarning)
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_mtx from `anndata` is deprecated. Import anndata.io.read_mtx instead.
  warnings.warn(msg, FutureWarning)
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_text from `anndata` is deprecated. Import anndata.io.read_text instead.
  warnings.warn(msg, FutureWarning)
/Users/kerl/.pyenv/versions/3.11.9/lib/python3.11/site-packages/anndata/utils.py:429: FutureWarning: Importing read_umi_tools from `anndata` is deprecated. Import anndata.io.read_umi_tools instead.

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.43%. Comparing base (33b104c) to head (ee4b946).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3306      +/-   ##
==========================================
+ Coverage   85.29%   85.43%   +0.13%     
==========================================
  Files          52       52              
  Lines        5517     5505      -12     
==========================================
- Hits         4706     4703       -3     
+ Misses        811      802       -9     

Flag	Coverage Δ
python	85.43% <55.55%> (+0.13%)	⬆️

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

Components	Coverage Δ
python_api	85.43% <78.57%> (+0.13%)	⬆️
libtiledbsoma	∅ <ø> (∅)

[ivirshup]

You could ignore the warning from scanpy at any point you import scanpy, but they will be silenced in upcoming scanpy releases.