Add Python 3.13, drop Python 3.10

[dstansby]

As per SPEC 0 we can drop Python 3.10, and this also adds tests for Python 3.13. Fixes #2317

[jhamman]

would you mind switching the base of this PR to the support/2.x branch?

[jhamman]

Looks good to me. I'm impressed things worked on 3.13 without any changes.

[joshmoore]

A bit late to the party but perhaps more for future cases of applying SPEC 0, I'd vote for always bumping the minor version when dropping a version of Python, i.e. I would have been for this being 2.19.0. The primary reason is that if something else occurs (critical data loss issue, etc.) it gives us the chance to fix that bug without forcing developers to bump their Python version.

[dstansby]

A bit late to the party but perhaps more for future cases of applying SPEC 0, I'd vote for always bumping the minor version when dropping a version of Python, i.e. I would have been for this being 2.19.0. The primary reason is that if something else occurs (critical data loss issue, etc.) it gives us the chance to fix that bug without forcing developers to bump their Python version.

👍 - might be worth adding a note to this effect to https://zarr.readthedocs.io/en/stable/contributing.html#api-compatibility so it doesn't get lost here?

[joshmoore]

Very fair point. Thoughts on having a third type of compatibility since it stretches the definition of "API compatibility"? Alternatively, it could be a note there.