### 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)

if self.auth_mount_point:
            _client.auth.approle.login(
                role_id=self.role_id, secret_id=self.secret_id, mount_point=self.auth_mount_point
            )
        else:
            _client.auth.approle.login(role_id=self.role_id, secret_id=self.secret_id)
    def _set_token(self, _client: hvac.Client) -> None:
        if self.token_path:
            with open(self.token_path) as f:
                _client.token = f.read().strip()
        else:
            _client.token = self.token
    def _parse_secret_path(self, secret_path: str) -> tuple[str, str]:
        if not self.mount_point:
            split_secret_path = secret_path.split("/", 1)
            if len(split_secret_path) < 2:
                raise InvalidPath
            return split_secret_path[0], split_secret_path[1]
        else:
            return self.mount_point, secret_path
    def get_secret(self, secret_path: str, secret_version: int | None = None) -> dict | None: