vault authorize-action uses deprecated hvac API method

[Vladimir Grevtsev]

https://github.com/openstack/charm-vault/blob/master/src/lib/charm/vault.py#L191

  :type client: hvac.Client
    :param policies: List of policy names
    :type policies: [str, str, ...]
    :returns: Id of created role
    :rtype: str"""
>>> client.create_role(

https://hvac.readthedocs.io/en/stable/source/hvac_v1.html#hvac.v1.Client.create_role

create_role(role_name, mount_point='approle', **kwargs)[source]
Call to deprecated function ‘create_role’. This method will be removed in version ‘0.12.0’ Please use the ‘create_or_update_approle’ method on the ‘hvac.api.auth_methods.approle’ class moving forward.

Although we are using old HVAC client, wouldn't we like to consider upgrading it?

(.venv) root@vault-3:/var/lib/juju/agents/unit-vault-2# pip3 freeze | grep hvac
hvac==0.6.4