[3.14] gh-105708: 'V' could be case insensitive for IPvFuture hostnames (GH-105709...

[3.14] gh-105708: 'V' could be case insensitive for IPvFuture hostnames (GH-105709) (#153139)

gh-105708: 'V' could be case insensitive for IPvFuture hostnames (GH-105709)

* gh-105708: 'V' could be case insensitive for IPvFuture hostnames

* gh-105708: 'V' could be case insensitive for IPvFuture hostnames & checking empty hostnames

* 📜🤖 Added by blurb_it.

* Fix the Merge changing \z to \Z.

* Fixed the News Entry.

* Fix the lint.

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(cherry picked from commit a47a66ccef0f98fcf088bc260ca14b889efa9b04)

Co-authored-by: Chandra <csreddy1998@gmail.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Senthil Kumaran <senthil@python.org>