Bump mysqlclient from 1.4.1 to 1.4.2
Bump mysqlclient from 1.4.1 to 1.4.2

Bumps [mysqlclient](https://github.com/PyMySQL/mysqlclient-python) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/PyMySQL/mysqlclient-python/releases)
- [Changelog](https://github.com/PyMySQL/mysqlclient-python/blob/master/HISTORY.rst)
- [Commits](https://github.com/PyMySQL/mysqlclient-python/compare/v1.4.1...v1.4.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
praekeltfoundation/debian-wheel-mirror