Unit tests failures under Cubed

[tomwhite]

From https://github.com/sgkit-dev/sgkit/actions/runs/12643635609/job/35229930346:

FAILED sgkit/tests/test_aggregation.py::test_count_variant_alleles__chunked[call_allele_count] - AssertionError: Left and right Dataset objects are not equal
Differing data variables:
L   variant_allele_count  (variants, alleles) uint64 800B cubed.Array<chunksize=(50, 2)>
R   variant_allele_count  (variants, alleles) uint64 800B cubed.Array<chunksize=(5, 2)>
L   call_allele_count     (variants, samples, alleles) uint8 1kB cubed.Array<chunksize=(50, 10, 2)>
R   call_allele_count     (variants, samples, alleles) uint8 1kB cubed.Array<chunksize=(5, 5, 2)>
FAILED sgkit/tests/test_aggregation.py::test_count_call_alleles__chunked - AssertionError: Left and right Dataset objects are not equal
Differing data variables:
L   call_allele_count   (variants, samples, alleles) uint8 1kB cubed.Array<chunksize=(50, 10, 2)>
R   call_allele_count   (variants, samples, alleles) uint8 1kB cubed.Array<chunksize=(5, 5, 2)>
FAILED sgkit/tests/test_pca.py::test_pca__array_backend[tsqr-numpy] - AttributeError: 'numpy.ndarray' object has no attribute 'name'
FAILED sgkit/tests/test_pca.py::test_pca__array_backend[tsqr-sgkit.distarray] - AttributeError: 'numpy.ndarray' object has no attribute 'name'

[tomwhite]

This needs pydata/xarray#9883