chore: use scverse-misc for data downloading

[flying-sheep]

Not using the anndata loader here since

1. we use datasetdir and not a global cache … maybe we should get rid of that.
2. we use the fallback_urls inspired by SnapATAC2 – maybe that should be added to upstream @timtreis @ilia-kats?

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• Closes Use scverse-misc for dataset downloading #4309
• Tests included or not required because:

• Release notes not necessary because:

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.98%. Comparing base (643dff3) to head (fd6cda7).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/scanpy/io/_read.py	66.66%	2 Missing ⚠️
src/scanpy/datasets/_datasets.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4310      +/-   ##
==========================================
- Coverage   82.03%   81.98%   -0.06%     
==========================================
  Files         134      134              
  Lines       13278    13235      -43     
==========================================
- Hits        10893    10851      -42     
+ Misses       2385     2384       -1     

Flag	Coverage Δ
hatch-test.low-vers	79.07% <91.66%> (-0.07%)	⬇️
hatch-test.pre	81.85% <91.66%> (-0.06%)	⬇️

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

Files with missing lines	Coverage Δ
src/scanpy/_utils/__init__.py	75.57% <ø> (-0.23%)	⬇️
src/scanpy/datasets/_utils.py	100.00% <100.00%> (ø)
src/scanpy/io/_download.py	94.73% <100.00%> (-3.45%)	⬇️
src/scanpy/datasets/_datasets.py	92.02% <90.00%> (+0.52%)	⬆️
src/scanpy/io/_read.py	80.59% <66.66%> (-0.52%)	⬇️

[ilia-kats]

Looks good to me, but see scverse/scverse-misc#75.

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