Release 25.1

[ichard26]

I'm mostly filing this now as I have some interest in being the next RM. Both to increase the maintainers available to do a release, and to give @sbidoul a break :)

There are several deprecations scheduled for removal in the 25.1 milestone which definitely makes it somewhat precarious, but I'd be happy to at least learn the mechanical parts and have someone else help me through the decision-making. pip 25.3 (October) is likely going to be a busy time for me, so 25.2 would be the best time for me to learn the release flow.

Any objections or thoughts? cc @pypa/pip-committers