**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
if name == 'airflow.providers.google.common.utils.id_token_credentials':
                return mock_id_token_credentials
            return orig_import(name, *args)
        with mock.patch('builtins.__import__', side_effect=import_mock), mock.patch.dict(
            'os.environ', AIRFLOW_CONN_AWS_DEFAULT=mock_connection.get_uri()
        ), mock.patch('airflow.providers.amazon.aws.hooks.base_aws.boto3') as mock_boto3, mock.patch(
            'airflow.providers.amazon.aws.hooks.base_aws.botocore'
        ) as mock_botocore, mock.patch(
            'airflow.providers.amazon.aws.hooks.base_aws.botocore.session'
        ) as mock_session:
            hook = AwsBaseHook(aws_conn_id='aws_default', client_type='airflow_test')
            credentials_from_hook = hook.get_credentials()
            mock_get_credentials = mock_boto3.session.Session.return_value.get_credentials
            assert (
                mock_get_credentials.return_value.get_frozen_credentials.return_value == credentials_from_hook
            )
        mock_boto3.assert_has_calls(
            [
                mock.call.session.Session(
                    aws_access_key_id=None,
                    aws_secret_access_key=None,
                    aws_session_token=None,
                    region_name=None,
                ),
                mock.call.session.Session()._session.__bool__(),
                mock.call.session.Session(
                    botocore_session=mock_session.Session.return_value,