Bump CMake requirement to 3.22 on main

[marcusmueller]

Feature Description

As seen in #7322, we tend to use cmake features not present in the fairly ancient minimum CMake version we demand (3.8); in that case, we'd need at least 3.20.

Considering cmake versions:

distro	release	cmake ver
debian	oldstable (bullseye)	3.18
debian	stable (bookworm)	3.25
Ubuntu	22.04	3.22
Ubuntu	23.10	3.27
Ubuntu	24.04	3.28
Ubuntu	24.10	3.27
Fedora	39	3.27
Fedora	40	3.28

I'd say that even for maint-3.10, cmake 3.18 would be safe (and I think even without #7294 we do use 3.16-ish features, anyway) . For main, we should go to at least 3.22 (if we decide that we want to target Ubuntu 22.04 with maint-3.10), or staright for 3.25.

So, this boils down to deciding:

• maint-3.10: Update at all? Updated to 3.18 or 3.22?
• main: Update to 3.22 or 3.25?

Feature Urgency

medium (would be nice to have in the near future)

More Information

No response

[dkozel]

@johnwparent and @mwoehlke-kitware Tagging you both as an FYI of the discussion and to ask for input on what features you're hoping or expecting to use in the installer work.

Thanks!

[willcode]

@marcusmueller Ubuntu 20.04 has 3.16 and has EOL in 2025, so we'd have to drop support.