Merge tag 'for-upstream-py38' of https://gitlab.com/bonzini/qemu into staging

Update CentOS 8 playbook and CI configuration to Python 3.8

The playbook has already been run by Cleber on the machine.

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# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
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* tag 'for-upstream-py38' of https://gitlab.com/bonzini/qemu:
  scripts/ci: bump CentOS Python to 3.8
  scripts/ci: unify package lists for CentOS in build-environment files
  scripts/ci: add capstone development packages
  scripts/ci: support CentOS Stream 8 in build-environment.yaml
  scripts/ci: remove unnecessary checks from CentOS playbook

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>