Pin zarr >=2,<3

[ericpre]

Zarr 3.0 has been released yesterday and has breaking changes. See https://zarr.readthedocs.io/en/v3.0.0/user-guide/v3_migration.html for more context. Until we support zarr 3, we need to make a release with zarr pin to <3.

@CSSFrancis, @jlaehne, we should merge this PR and make a release ASAP.

Progress of the PR

• Pin zarr to >=2, <3,
• [n/a] update docstring (if appropriate),
• update user guide (if appropriate),
• add a changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting of the changelog entry (and eventual user guide changes) in the docs/readthedocs.org:rosettasciio build of this PR (link in github checks)
• [n/a] add tests,
• ready for review.

[CSSFrancis]

I think I should have a bit more on top of this. Let's merge and make a release. I'll try to scope out what adding support for zarr 3.0.0 looks like today.

Edit: Let's merge once the CI passes 😅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.84%. Comparing base (85a2d9d) to head (8c6bbde).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #351   +/-   ##
=======================================
  Coverage   87.84%   87.84%           
=======================================
  Files          85       85           
  Lines       11246    11246           
  Branches     2084     2084           
=======================================
  Hits         9879     9879           
  Misses        868      868           
  Partials      499      499           

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[ericpre]

I was aware this was coming of the warning in the test suite and I started a branch a while ago on this but I was expecting the release not to be so soon! 😅
Overall, I don't think that much is needed but I didn't check the support of files written with zarr version 2, though...

[CSSFrancis]

I was aware this was coming of the warning in the test suite and I started a branch a while ago on this but I was expecting the release not to be so soon!

I was aware of this too but kind of thought they were a bit stuck with trying to optimize things so I figured it might be a little bit. I guess someone got a lot of work done over the winter break 😅

[CSSFrancis]

It seems like they are not planning to support object dtypes which seems like a large issue for us... zarr-developers/zarr-python#2617