Description of problem:
Package python-zarr fails to build from source in Fedora Rawhide.

Version-Release number of selected component (if applicable):
2.18.4-2.fc42

Steps to Reproduce:
koji build --scratch f43 python-zarr-2.18.4-2.fc42.src.rpm

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/python-zarr

Reproducible: Always

Actual Results:
==================================== ERRORS ====================================
_________________________ ERROR collecting zarr/tests __________________________
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1387: in _gcd_import
    ???
<frozen importlib._bootstrap>:1360: in _find_and_load
    ???
<frozen importlib._bootstrap>:1310: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:488: in _call_with_frames_removed
    ???
<frozen importlib._bootstrap>:1387: in _gcd_import
    ???
<frozen importlib._bootstrap>:1360: in _find_and_load
    ???
<frozen importlib._bootstrap>:1310: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:488: in _call_with_frames_removed
    ???
<frozen importlib._bootstrap>:1387: in _gcd_import
    ???
<frozen importlib._bootstrap>:1360: in _find_and_load
    ???
<frozen importlib._bootstrap>:1331: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:935: in _load_unlocked
    ???
<frozen importlib._bootstrap_external>:1026: in exec_module
    ???
<frozen importlib._bootstrap>:488: in _call_with_frames_removed
    ???
zarr/__init__.py:3: in <module>
    from zarr.convenience import (
zarr/convenience.py:8: in <module>
    from zarr._storage.store import data_root, meta_root, assert_zarr_v3_api_available
zarr/_storage/store.py:10: in <module>
    from zarr.meta import Metadata2, Metadata3
zarr/meta.py:10: in <module>
    from zarr.util import json_dumps, json_loads
zarr/util.py:33: in <module>
    from numcodecs.blosc import cbuffer_sizes, cbuffer_metainfo
E   ImportError: cannot import name 'cbuffer_sizes' from 'numcodecs.blosc' (/usr/lib64/python3.13/site-packages/numcodecs/blosc.cpython-313-x86_64-linux-gnu.so)