Update mysqlclient to 2.1.0

[pyup-bot]

This PR updates mysqlclient from 2.0.3 to 2.1.0.

Changelog

2.1.0

======================

Release: 2021-11-17

* Add ``multistatement=True`` option. You can disable multi statement. (500).
* Remove unnecessary bytes encoder which is remained for Django 1.11
compatibility (490).
* Deprecate ``passwd`` and ``db`` keyword. Use ``password`` and ``database``
instead. (488).
* Windows: Binary wheels are built with MariaDB Connector/C 3.2.4. (508)
* ``set_character_set()`` sends ``SET NAMES`` query always. This means
all new connections send it too. This solves compatibility issues
when server and client library are different version. (509)
* Remove ``escape()`` and ``escape_string()`` from ``MySQLdb`` package.
(511)
* Add Python 3.10 support and drop Python 3.5 support.

======================

Links

• PyPI: https://pypi.org/project/mysqlclient
• Changelog: https://pyup.io/changelogs/mysqlclient/
• Repo: https://github.com/PyMySQL/mysqlclient

[pyup-bot]

Closing this in favor of #185