Update mysqlclient requirement from <2.1.1 to <2.1.2

Updates the requirements on [mysqlclient](https://github.com/PyMySQL/mysqlclient) to permit the latest version.
- [Release notes](https://github.com/PyMySQL/mysqlclient/releases)
- [Changelog](https://github.com/PyMySQL/mysqlclient/blob/main/HISTORY.rst)
- [Commits](PyMySQL/mysqlclient@MySQLdb-0.3.3...v2.1.1)

---
updated-dependencies:
- dependency-name: mysqlclient
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

test-requirements.txt

@@ -1,4 +1,4 @@
 factory-boy<3.3.0
 testfixtures==6.18.5
 psycopg2>=2.5.4
-mysqlclient<2.1.1
+mysqlclient<2.1.2