Pymongo-auth-aws

------------------------

- Use ``boto3`` to fetch on-demand credentials, expanding and standardizing
authorization capabilities. This includes EKS IAM credentials that use
``AssumeRoleWithWebIdentity``.
- Enable opt-in caching of fetched on-demand credentials, to prevent rate
limiting.
- Make the ``pymongo_auth_aws.auth.aws_temp_credentials`` function public
so it can be used in ``pymongocrypt``.

------------------------

- Fix a bug which caused MONGODB-AWS authentication to fail in some
EC2 Instance configurations. Previous versions incorrectly used a POST
request when creating the session token for Instance Metadata Service
Version 2 (IMDSv2).

------------------------

- Fix a bug which caused authentication to fail when using non-default
STS hosts with more than one dot (``.``). For example,
"sts.us-west-2.amazonaws.com" is a valid STS host that would fail in
version 1.0.0.

------------------------

- Initial version.
- Implements `MONGODB-AWS authentication`_ support for PyMongo.

.. _MONGODB-AWS authentication:
https://github.com/mongodb/specifications/blob/8f16c36/source/auth/auth.rst#mongodb-aws