We'd like to bump the minimum required CMake version for building and using Qt 
to CMake 3.26.

The pending change is https://codereview.qt-project.org/c/qt/qtbase/+/603886

The rationale is easier maintenance of build system code, and allowing to 
provide better public cmake apis and behaviors
(cleaner qml module apis, better deployment handling, better android handling, 
better static linking handling, to name a few).

The timing is good because Qt 6.9 is non-LTS.

one point to consider is that cmake does not have any run-time dependencies and it is extremely easy to install independently from the OS: the binaries provided by kitware are fully self-contained and can be installed in parallel to system-provided cmake. if it eases the maintenance and allows better public APIs, it does not seem unreasonable to bump the minimum required version.

tim

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