[3.10] Update Sphinx bpo role to use redirect URI. (#91890)

* Update Sphinx bpo role to use redirect URI. (GH-32342)

* [3.10] Update Sphinx bpo role to use redirect URI. (GH-32342).
(cherry picked from commit 08cfe079503ffd19d8b7ab324f0fdb1c6b150ca8)

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>

* Fix whitespace.