Merge tag 'pull-request-2024-04-25' of https://gitlab.com/thuth/qemu into staging

* Update OpenBSD CI image to 7.5
* Update/remove Ubuntu 20.04 CI jobs
* Update (most) CentOS 8 CI jobs to CentOS 9
* Some clean-ups and improvements to travis.yml
* Minor test fixes
* s390x header clean-ups
* Doc updates

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# gpg: Signature made Thu 25 Apr 2024 07:55:42 AM PDT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]

* tag 'pull-request-2024-04-25' of https://gitlab.com/thuth/qemu:
  target/s390x: Remove KVM stubs in cpu_models.h
  tests/unit: Remove debug statements in test-nested-aio-poll.c
  docs/devel: fix minor typo in submitting-a-patch.rst
  hw/s390x: Include missing 'cpu.h' header
  tests: Update our CI to use CentOS Stream 9 instead of 8
  tests/docker/dockerfiles: Run lcitool-refresh after the lcitool update
  tests/lcitool/libvirt-ci: Update to the latest master branch
  tests: Remove Ubuntu 20.04 container
  .travis.yml: Do some more testing with Clang
  .travis.yml: Update the jobs to Ubuntu 22.04
  .travis.yml: Remove the unused UNRELIABLE environment variable
  Revert ".travis.yml: Cache Avocado cache"
  tests/vm: update openbsd image to 7.5
  docs: i386: pc: Update maximum CPU numbers for PC Q35
  tests/qtest : Use `g_assert_cmphex` instead of `g_assert_cmpuint`
  MAINTAINERS: update email of Peter Lieven

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>