Mac Readme doc mentions bpo

[Mariatta]

Documentation

In: https://github.com/python/cpython/blob/main/Mac/README.rst#L351

It says

configure: WARNING:     ## Report this to https://bugs.python.org/ ##

Since we no longer use b.p.o, this link is not correct.

Linked PRs

• gh-100893: update bpo reference in Mac README #100905
• [3.11] gh-100893: update bpo reference in Mac README (GH-100905) #100906
• [3.10] gh-100893: update bpo reference in Mac README (GH-100905) #100907