[3.12] gh-127734: improve signature of `urllib.request.HTTPPasswordMgrWithPriorAuth.__init__` (GH-127735) (#127745)

gh-127734: improve signature of `urllib.request.HTTPPasswordMgrWithPriorAuth.__init__` (GH-127735)

improve signature of urllib.request.HTTPPasswordMgrWithPriorAuth.__init__
(cherry picked from commit a03efb533a58fd13fb0cc7f4a5c02c8406a407bd)

Co-authored-by: Stephen Morton <git@tungol.org>