ubuntu:focal -> ubuntu:jammy

[larseggert]

Because a bunch of deps are old again:

-- CMAKE Version: 3.16.3
-- Source Dir: /data/riotbuild/riotbase/build/pkg/msquic
-- Host System name: Linux
-- Setting policy 0091
-- System name: Generic
-- System version: 1
-- Platform version:
-- Build type: MinSizeRel
-- QUIC Platform: riot
CMake Error at CMakeLists.txt:116 (cmake_minimum_required):
  CMake 3.20 or higher is required.  You are running version 3.16.3

[larseggert]

And of course I should have checked PRs first and then would have seen #189...