New packages: python3-pyside6 + shiboken6 (Qt for python)

[fanyx]

General

• This new package conforms to the package requirements

Testing the changes

• I tested the changes in this PR: YES|briefly|NO

Local build testing

• I built this PR locally for my native architecture, (x86_64-glibc)

Package requests

Closes #39975

[chrysos349]

=> shiboken6-6.5.0_1: fetching distfile 'pyside-setup-opensource-src-6.5.0.tar.xz' from 'https://download.qt.io/official_releases/QtForPython/pyside6/PySide6-6.5.0-src/pyside-setup-opensource-src-6.5.0.tar.xz'...
https://download.qt.io/official_releases/QtForPython/pyside6/PySide6-6.5.0-src/pyside-setup-opensource-src-6.5.0.tar.xz: Not Found
=> ERROR: shiboken6-6.5.0_1: failed to fetch 'pyside-setup-opensource-src-6.5.0.tar.xz'.

Here is the correct link
https://download.qt.io/official_releases/QtForPython/pyside6/PySide6-6.5.0-src/pyside-setup-everywhere-src-6.5.0.tar.xz

[github-actions]

Pull Requests become stale 90 days after last activity and are closed 14 days after that. If this pull request is still relevant bump it or assign it.

[fanyx]

taken over by @agausmann in #44418