**Apache Airflow version**: 1.10.8 (Patched with latest AWS Hook)

**Environment**:

- **Cloud provider or hardware configuration**: 4 VCPU 8GB RAM VM
- **OS** (e.g. from /etc/os-release): RHEL 7.7
- **Kernel** (e.g. `uname -a`): Linux 3.10.0-957.el7.x86_64
- **Install tools**:
- **Others**:
The AWS Hook functionality for AssumeRoleWithSAML is not available in this version, we manually added it via patching the hook file.

**What happened**:
We've been using this hook for a while now with this issue, basically sts.assume_role and sts.assume_role_with_saml will return temporary credentials that are only valid for eg 1 hour by default. Eventually with long running operators / hooks / sensors some of them fail because the credentials have expired.

Example error messages
An error occurred (ExpiredTokenException) when calling the AssumeRole operation: Response has expired
An error occurred (ExpiredTokenException) when calling the AssumeRoleWithSAML operation: Response has expired
botocore.exceptions.ClientError: An error occurred (ExpiredTokenException) when calling the <any operation here> operation: The security token included in the request is expired

**What you expected to happen**:

AWS hook should be updated to use boto3 RefreshableCredentials when temporary credentials are in use.

**How to reproduce it**:

Use any of the assume role methods with the AWS Hook, create a session, wait 1 hour (or whatever expiry period applies to your role), and try and use the hook again.

**Anything else we need to know**:

I have a solution, please self-assign this.
airflow/providers/amazon/aws/hooks/base_aws.py
config_file_name: str, config_format: Optional[str] = "boto", profile: Optional[str] = None
) -> Tuple[Optional[str], Optional[str]]:
    """
    Parses a config file for s3 credentials. Can currently
    parse boto, s3cmd.conf and AWS SDK config formats
    :param config_file_name: path to the config file
    :type config_file_name: str
    :param config_format: config type. One of "boto", "s3cmd" or "aws".
        Defaults to "boto"
    :type config_format: str
    :param profile: profile name in AWS type config file
    :type profile: str
    """
    config = configparser.ConfigParser()
    if config.read(config_file_name):  
        sections = config.sections()
    else:
        raise AirflowException(f"Couldn't read {config_file_name}")
    
    if config_format is None:
        config_format = "boto"