Fix test cases in v0.5

[clbarnes]

Fixes the test cases listed in ome/ngff#325

[github-actions]

Automated Review URLs

• Readthedocs

[clbarnes]

The failing test is somewhat subjective, about the image label's color JSON array. The spec says "this contains one entry per label", which is probably a MUST. If the label zarr array were zero-size, the color JSON array could strictly be empty and valid, although that's obviously a pathological case. I'm OK with reverting this test to empty color arrays as invalid.

[clbarnes]

If this is acceptable I'll make the same changes to the previous and future versions.

[jo-mueller]

LGTM 👍

[lubianat]

think the fixes are good, but I wonder if we could drop updates for some of the older versions, if only to reduce the noise here and in the dependabot PRs

Following the lead on ome-zarr-py, maybe we don't propagate this (and similar) changes for ≤ 0.3?

Not sure on the correct protocol here, though