allow uploads of wheels targeting macOS 26

[btucker]

macOS 26 was released on 2025-09-15. PyPI should allow wheels targeting it.

[di]

Given that Apple has switched to year-based versioning, we might need to update the spec at https://packaging.python.org/en/latest/specifications/platform-compatibility-tags/#macos to account for this first.

[btucker]

Given that Apple has switched to year-based versioning, we might need to update the spec at https://packaging.python.org/en/latest/specifications/platform-compatibility-tags/#macos to account for this first.

@di How are you thinking the spec should change?

[di]

Right now it just says:

They must both be positive integers, with the x value being >= 10.

It would be nice if this said something like:

They must both be positive integers, with the x value being either 10 <= x <= 15, or >=26 and correspond to the year of the macOS release.

[btucker]

@di Sounds good. I just opened pypa/packaging.python.org#1943