Run tests also with python3.11

[larsevj]

The actual tests explicitly tests for python3.8 by mocking a komodo. Now that we are building releases for python3.11 we should also test with python3.11.

[larsevj]

See:

@pytest.fixture(scope="session")
def python38_path():
    """Locate Python 3.8 executable

    On RHEL 7 python3.8 is found in SCL, but on RHEL 8 and Ubuntu (used by
    Github Actions) has it installed in the system.

    RHEL7        : yum install rh-python38-devel
    RHEL8        : yum install python38-devel
    Ubuntu 18.04 : apt-get install python3-venv python3.8-{dev,venv}
    """
    for exe in "/usr/bin/python3.8", "/opt/rh/rh-python38/root/bin/python3.8":
        if os.path.isfile(exe):
            return exe
    else:
        raise RuntimeError("Could not locate python3.8")