[3.9] gh-91423: Remove bugs.python.org from bugs.rst (GH-91425) (GH-95614)

Co-authored-by: roy reznik <royreznik@gmail.com>
Co-authored-by: Inada Naoki <songofacandy@gmail.com>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com&gt;.>
(cherry picked from commit df81d289)