### Apache Airflow version

2.6.1

### What happened

Trying to connect to Vault using `auth_type` = `aws_iam`. I am receiving the following error: `AttributeError: 'Client' has no attribute 'auth_aws_iam'`. Looking through [the code](https://github.com/apache/airflow/blob/main/airflow/providers/hashicorp/_internal_client/vault_client.py#L303), you are using `client.auth_aws_iam`, but the [HVAC docs](https://hvac.readthedocs.io/en/stable/usage/auth_methods/aws.html#caveats-for-non-default-aws-regions) use `client.auth.aws.iam_login`. You should also add support for `boto3.Session()` to use role based access.

### What you think should happen instead

Airflow should authenticate to Vault using AWS auth.

### How to reproduce

Setup a secrets backend of `airflow.providers.hashicorp.secrets.vault.VaultBackend` and set `auth_type` = `aws_iam`. It will error out saying that the client doesn't have an attribute named `auth_aws_iam`.

### Operating System

Docker

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### Anything else

_No response_

### Are you willing to submit 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)

return _client
        else:
            raise VaultError("Vault Authentication Error!")
    def _auth_userpass(self, _client: hvac.Client) -> None:
        if self.auth_mount_point:
            _client.auth_userpass(
                username=self.username, password=self.password, mount_point=self.auth_mount_point
            )
        else:
            _client.auth_userpass(username=self.username, password=self.password)
    def _auth_radius(self, _client: hvac.Client) -> None:
        if self.auth_mount_point:
            _client.auth.radius.configure(
                host=self.radius_host,
                secret=self.radius_secret,
                port=self.radius_port,
                mount_point=self.auth_mount_point,
            )
        else:
            _client.auth.radius.configure(
                host=self.radius_host, secret=self.radius_secret, port=self.radius_port
            )
    def _auth_ldap(self, _client: hvac.Client) -> None:
        if self.auth_mount_point:
            _client.auth.ldap.login(
                username=self.username, password=self.password, mount_point=self.auth_mount_point
            )
        else:
            _client.auth.ldap.login(username=self.username, password=self.password)
    def _auth_kubernetes(self, _client: hvac.Client) -> None: