Update dependency mysqlclient to v2.1.1

This MR contains the following updates:

Package	Update	Change
mysqlclient	patch	==2.1.0 -> ==2.1.1

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Release Notes

PyMySQL/mysqlclient

v2.1.1

Compare Source

What's Changed

• Add module attributes to exception classes. by @​methane in https://github.com/PyMySQL/mysqlclient/pull/523
• Fix out of range bug by @​methane in https://github.com/PyMySQL/mysqlclient/pull/538
• Fix docstring for _mysql.connect by @​Llewyllen in https://github.com/PyMySQL/mysqlclient/pull/540
• Update CI settings by @​methane in https://github.com/PyMySQL/mysqlclient/pull/541

New Contributors

• @​Llewyllen made their first contribution in https://github.com/PyMySQL/mysqlclient/pull/540

Full Changelog: https://github.com/PyMySQL/mysqlclient/compare/v2.1.0...v2.1.1

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