[3.11] gh-103848: Adds checks to ensure that bracketed hosts found by urlsplit are of IPv6 or IPvFuture format (GH-103849) (#104349)

gh-103848: Adds checks to ensure that bracketed hosts found by urlsplit are of IPv6 or IPvFuture format (GH-103849)

* Adds checks to ensure that bracketed hosts found by urlsplit are of IPv6 or IPvFuture format

---------

(cherry picked from commit 29f348e232e82938ba2165843c448c2b291504c5)

Co-authored-by: JohnJamesUtley <81572567+JohnJamesUtley@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>