Dropping support for Ubuntu 20.04 (the minimum requirement now is 22.04)

[Dmitry Kazakov]

Hi, all!

Just wanted to let you know that I have completed switching our nightly
builds to Ubuntu 22.04 base image. It effectively means that we no longer
support 20.04 (which reaches EOL this month).

I will keep the images and packages for the developer environment for two
more weeks, then I will drop them as well. Developers using the docker
environment are recommended to recreate their containers based on the
latest master branches :)

PS:
The existing containers will continue to work unless you try to refetch
some deps (by running `run-ci-build.py` manually). If you don't work with
Krita deps, you usually never have to do that :)

-- 
Dmitry Kazakov
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