Ec2-metadata

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* Add ``tags`` attribute, a mapping of the instance tags.
This requires the corresponding EC2 feature to be enabled on the instance.

Thanks to Renan Rodrigues in `PR 344 <https://github.com/adamchainz/ec2-metadata/pull/344>`__.

* Add ``spot_instance_action`` attribute.

Thanks to Quimey Vivas in `PR 346 <https://github.com/adamchainz/ec2-metadata/pull/346>`__.

* Add ``domain`` and ``partition`` attributes.

Thanks to Terry Griffin in `PR 339 <https://github.com/adamchainz/ec2-metadata/pull/339>`__.

* Add ``instance_profile_name`` and ``iam_security_credentials`` attributes.

Thanks to Jean-Sebastien Jeannotte in `PR 313 <https://github.com/adamchainz/ec2-metadata/pull/313>`__.

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* Drop Python 3.6 support.

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* Support Python 3.10.

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* Add ``availability_zone_id`` attribute.
* Add type hints.

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* Use ``functools.cached_property`` on Python 3.8+, removing the dependency on
the ``cached-property`` package.

* Stop distributing tests to reduce package size. Tests are not intended to be
run outside of the tox setup in the repository. Repackagers can use GitHub's
tarballs per tag.

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* Drop Python 3.5 support.
* Support Python 3.9.
* Move license from ISC to MIT License.