Update bundled pip to 26.2

[ichard26]

Feature or enhancement

Proposal:

ensurepip's bundled version of pip gets updated to the current latest release, 26.2. See also: https://discuss.python.org/t/announcement-pip-26-2/108319.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-155063: Upgrade bundled pip to 26.2 #155064