### Description

Support mounting to multiple namespaces with the Hashicorp Vault Secrets Back-end

### Use case/motivation

As a data engineer I wish to utilize secrets stored in multiple mount paths (to support connecting to multiple namespaces)  without having to mount to a higher up namespace.

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

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"""Objects relating to sourcing connections & variables from Hashicorp Vault"""
from __future__ import annotations
import warnings
from typing import TYPE_CHECKING
from airflow.providers.hashicorp._internal_client.vault_client import _VaultClient
from airflow.secrets import BaseSecretsBackend
from airflow.utils.log.logging_mixin import LoggingMixin
class VaultBackend(BaseSecretsBackend, LoggingMixin):