Proposal to Update Minimum CMake Version to 3.22

[Kevin Kofler]

Ingo Klöcker wrote:
> The rule is current minor version of Qt minus 2. As a matter of fact,
> Albert has just raised the minimum Qt required by KDE Frameworks to 6.7.
> https://invent.kde.org/frameworks/kconfig/-/commit/
> 1e40d290384e36b079dcb190b59a566adfdbddd0

Good to know, but Qt 6.7 still only requires CMake >= 3.16, like Qt 6.5 and 
6.6, so this does not really change anything for this discussion.

        Kevin Kofler