[release-monitoring] Fix poetry deployment
    
    Poetry deployment is too different in container than the deployment we used
    before. Let's try to use `pip-3 install .` as before, thanks to PEP-517, this
    should work as expected.
    
    [PEP-517](https://peps.python.org/pep-0517/)
    
    Signed-off-by: Michal Konečný <mkonecny@redhat.com>