Bump mysqlclient from 2.0.3 to 2.1.0

Bumps [mysqlclient](https://github.com/PyMySQL/mysqlclient) from 2.0.3 to 2.1.0.
- [Release notes](https://github.com/PyMySQL/mysqlclient/releases)
- [Changelog](https://github.com/PyMySQL/mysqlclient/blob/main/HISTORY.rst)
- [Commits](PyMySQL/mysqlclient@v2.0.3...v2.1.0)

---
updated-dependencies:
- dependency-name: mysqlclient
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -18,7 +18,7 @@ tweepy = "^4.4.0"
 SQLAlchemy = "1.3.24"
 sys-vars = "^4.0.3"
 urllib3 = "^1.26.7"
-mysqlclient = "^2.0.3"
+mysqlclient = "^2.1.0"
 Flask-SQLAlchemy = "^2.5.1"
 flask-smorest = "^0.35.0"