Update django-storages to 1.13.1

[pyup-bot]

This PR updates django-storages[boto3] from 1.12.3 to 1.13.1.

Changelog

1.13.1

*******************

Dropbox
-------

- Strip off the root path when saving files to fix saving with upgraded versions of Django (`1168`_)
- Update ``DropBoxStorage`` constructor parameter order to be backwards compatible (`1167`_)

.. _1167: https://github.com/jschneier/django-storages/pull/1167
.. _1168: https://github.com/jschneier/django-storages/pull/1168

1.13

*****************

General
-------

- Add support for Django 4.0 and 4.1 (`1093`_)
- Drop support for Django 2.2, 3.0 and 3.1 (`1093`_)
- Drop support for Python 3.5 and 3.6 (`1093`_)

S3
--

- **Breaking** Update and document the undocumented ``AWS_S3_URL_PROTOCOL`` from ``http:`` to ``https:`` and remove the
undocumented ``AWS_S3_SECURE_URLS`` setting. You should only need to update your settings if you had updated either of
these previously undocumented settings.  The default behavior of constructing an ``https:`` URL with a custom domain
is unchanged. (`1164`_)
- Add ``AWS_S3_USE_THREADS`` to disable ``threading`` for compatibility with ``gevent`` (`1112`_)

Dropbox
-------

- Add support for refresh tokens (`1159`_)
- Ignore ``ApiError`` exception in ``url()`` (`1158`_)

Azure
-----

- Restore support for ``AZURE_ENDPOINT_SUFFIX`` (`1118`_)
- Replace deprecated ``download_to_stream`` with ``readinto`` (`1113`_)
- Add ``AZURE_API_VERSION`` setting (`1132`_)
- Fix ``get_modified_time()`` (`1134`_)

Google Cloud
------------

- Add support for gzipping files via ``GS_IS_GZIPPED`` and ``GZIP_CONTENT_TYPES`` (`980`_)
- Use ``GS_BLOB_CHUNK_SIZE`` with files that already exist

.. _980: https://github.com/jschneier/django-storages/pull/980
.. _1118: https://github.com/jschneier/django-storages/pull/1118
.. _1113: https://github.com/jschneier/django-storages/pull/1113
.. _1112: https://github.com/jschneier/django-storages/pull/1112
.. _1132: https://github.com/jschneier/django-storages/pull/1132
.. _1134: https://github.com/jschneier/django-storages/pull/1134
.. _1159: https://github.com/jschneier/django-storages/pull/1159
.. _1158: https://github.com/jschneier/django-storages/pull/1158
.. _1164: https://github.com/jschneier/django-storages/pull/1164
.. _1093: https://github.com/jschneier/django-storages/pull/1093

Links

• PyPI: https://pypi.org/project/django-storages
• Changelog: https://pyup.io/changelogs/django-storages/
• Repo: https://github.com/jschneier/django-storages