[3.12] gh-74668: Fix support of bytes in urllib.parse.parse_qsl() (GH-115771) (GH-116366)

urllib.parse functions parse_qs() and parse_qsl() now support bytes
arguments containing raw and percent-encoded non-ASCII data.
(cherry picked from commit bdba8ef42b15e651dc23374a08143cc2b4c4657d)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>