[3.8] Update Sphinx bpo role to use redirect URI. (#91892)

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

* [3.8] Update Sphinx bpo role to use redirect URI. (GH-32342).
(cherry picked from commit 08cfe07)

Co-authored-by: Ezio Melotti <[email protected]>

Author: ezio-melotti