(feat): support for zarr-python>=3.0.0b0

[ilan-gold]

• Closes #
• Tests added
• Release note added (or unnecessary)

[codecov]

Codecov Report

Attention: Patch coverage is 74.60317% with 16 lines in your changes missing coverage. Please review.

Project coverage is 82.43%. Comparing base (2602e5b) to head (aafcc7a).

Files with missing lines	Patch %	Lines
src/anndata/_io/specs/methods.py	57.69%	11 Missing ⚠️
src/anndata/_settings.py	80.00%	2 Missing ⚠️
src/anndata/tests/helpers.py	71.42%	2 Missing ⚠️
src/anndata/_io/specs/registry.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1726      +/-   ##
==========================================
- Coverage   87.01%   82.43%   -4.58%     
==========================================
  Files          40       40              
  Lines        6059     6087      +28     
==========================================
- Hits         5272     5018     -254     
- Misses        787     1069     +282     

Files with missing lines	Coverage Δ
src/anndata/_core/sparse_dataset.py	92.35% <100.00%> (-0.67%)	⬇️
src/anndata/_io/utils.py	76.66% <ø> (ø)
src/anndata/_io/zarr.py	70.00% <100.00%> (-13.55%)	⬇️
src/anndata/compat/__init__.py	69.87% <100.00%> (-15.49%)	⬇️
src/anndata/experimental/merge.py	91.79% <100.00%> (ø)
src/anndata/_io/specs/registry.py	95.13% <92.30%> (-0.89%)	⬇️
src/anndata/_settings.py	88.67% <80.00%> (-5.44%)	⬇️
src/anndata/tests/helpers.py	81.36% <71.42%> (-13.00%)	⬇️
src/anndata/_io/specs/methods.py	85.17% <57.69%> (-3.36%)	⬇️

... and 8 files with indirect coverage changes

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[ilan-gold]

blockers:

• v2 Object Encoding in 3.x.x python package zarr-developers/zarr-python#2500