Bump mysqlclient from 1.4.2.post1 to 1.4.4 in /requirements
Bump mysqlclient from 1.4.2.post1 to 1.4.4 in /requirements

Bumps [mysqlclient](https://github.com/PyMySQL/mysqlclient-python) from 1.4.2.post1 to 1.4.4.
- [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/v1.4.2.post1...v1.4.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
KWierso/treeherder,KWierso/treeherder,KWierso/treeherder,KWierso/treeherder