[python-qemu-qmp MR #6] GitLab: add python3.11 to python container

[GitLab Bot]

Author: John Snow - https://gitlab.com/jsnow
Merge Request: 
https://gitlab.com/qemu-project/python-qemu-qmp/-/merge_requests/6
... from: jsnow/python-qemu-qmp:install_python_311
... into: qemu-project/python-qemu-qmp:main

*Actually* install Python 3.11 to the container that is used during the
GitLab pipeline. Without this, the test is just skipped, which isn't
that helpful.

Signed-off-by: John Snow <jsnow@redhat.com>

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