API: Make any and all return booleans by default

[seberg]

The method supports a dtype= argument, but I am thinking to promote np.logical_or.reduce() instead.

Closes gh-4352

[mattip]

This probably needs some changes in the doc string if not some mention somewhere in the user documentation. It is somewhat niche but a large change in UX

[seberg]

The any/all docs already claim to always return booleans. We could add a .. versionchanged:: directly in their notes?

[seberg]

The any/all docs already claim to always return booleans. We could add a .. versionchanged:: directly in their notes?

That seems very reasonable to me on second thought, so I did that.

[mattip]

Bleh. I think doc building is failing because of some partial merge with main, and the requirements file moved in #25697.

[mattip]

LGTM, once CI is happy.

[seberg]

Hmmm, will try to close/reopen, circleci choked on something.

[seberg]

Sorry, I missed your comment jumping to the end, will try rebasing then...

[seberg]

OK, CI happy now, thanks for the review Matti.