Update zarr in SPEC 0

[dstansby]

SPEC 0 has a nice chart illustrating when projects should drop scientific python dependencies: https://scientific-python.org/specs/spec-0000/#support-window. This includes zarr, but is out of date - at least it doesn't have v3 in the figure, and I'm guessing some of the dates from v2 might need checking too.

[joshmoore]

Thanks, @dstansby. Definitely for keeping this aligned with the zarr-python team's intents. We might ask for guidance for the scientific python folks if, e.g., we wanted to shorten the 2.18.x line since the statement has been in the wild for a while.

[jhamman]

I posted scientific-python/specs#384 to get some clarity on their update process.

[jhamman]

In the issue linked above, it was explained that the page is updated quarterly and is due to be updated this week (or so).

[dstansby]

scientific-python/specs#385 didn't update the zarr versions listed in the gantt chart, so I don't think this is fixed - e.g., 3.0 isn't on there.

[jhamman]

The chart was updated in that PR:

In the future, let's open issues related to this topic upstream.

[dstansby]

Ah, I must have had a cached version. Looks good now 👍