VCZ fixtures for Zarr format v3

[tomwhite]

Are there Zarr format v3 versions of the VCZ fixtures? I can't see any and if I run

BIO2ZARR_ZARR_FORMAT=3 uv run pytest -vs 'tests/test_vcf_writer.py::test_write_vcf__icechunk'

I get

E       icechunk.IcechunkError:   x invalid zarr key format `variant_quality/2`
E         | 
E         | context:
E         |    0: icechunk::store::set
E         |            with key="variant_quality/2"
E         |              at icechunk/src/store.rs:273
E         | 
E         `-> invalid zarr key format `variant_quality/2`

But the CI is passing, so not sure what I'm missing...