Bumped minimum Cmake version to fix build issues on Cmake 4.0.

[borgmanJeremy]

This resolves the aur issue building flameshot-git. Flameshot also will fail to build in arch until this is bumped. Cmake 3.22 was chosen since that is the version on Ubuntu 22.04.

Ideally all the external dependencies need refreshed, but that's much more work.

[FelixJochems]

Workaround

I think the original project has since moved to gitlab. I'll see if we can do an in place upgrade.

Edit: just checked, seems like updating the qt-colors widget isn't supercomplicated. I'll raise a PR at the end of the weekend

[mmahmoudian]

We should remove the Ubuntu 20.04 as it is EOL by the end of this month, but I can't figure out why the Debian 11 CIs are failing

[borgmanJeremy]

Looks like Debian 11 uses Cmake 3.18. If that’s a valid target I can lower it to 3.18 and see if the CI passes

[mmahmoudian]

@borgmanJeremy Thanks for checking it out. It was bugging me why it fails and I couldn't figure it out.