**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.
tests/providers/amazon/aws/hooks/test_base_aws.py
conn = boto3.client('iam', region_name='us-east-1')
        conn.create_role(RoleName='test-role', AssumeRolePolicyDocument='some policy')
        hook = AwsBaseHook(aws_conn_id='aws_default', client_type='airflow_test')
        arn = hook.expand_role('test-role')
        expect_arn = conn.get_role(RoleName='test-role').get('Role').get('Arn')
        assert arn == expect_arn
    def test_use_default_boto3_behaviour_without_conn_id(self):
        for conn_id in (None, ''):
            hook = AwsBaseHook(aws_conn_id=conn_id, client_type='s3')
            
            hook.get_client_type('s3')
class ThrowErrorUntilCount:
    """Holds counter state for invoking a method several times in a row."""
    def __init__(self, count, quota_retry, **kwargs):
        self.counter = 0
        self.count = count
        self.retry_args = quota_retry
        self.kwargs = kwargs
        self.log = None
    def __call__(self):
        """
        Raise an Forbidden until after count threshold has been crossed.
        Then return True.
        """
        if self.counter < self.count:
            self.counter += 1
            raise Exception()
        return True
def _always_true_predicate(e: Exception):