Bump mysqlclient from 2.2.3 to 2.2.4 (#441)

Bumps [mysqlclient](https://github.com/PyMySQL/mysqlclient) from 2.2.3 to 2.2.4.
- [Release notes](https://github.com/PyMySQL/mysqlclient/releases)
- [Changelog](https://github.com/PyMySQL/mysqlclient/blob/main/HISTORY.rst)
- [Commits](PyMySQL/mysqlclient@v2.2.3...v2.2.4)

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

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setup.py

@@ -60,7 +60,7 @@
     install_requires=[
         'docopt==0.6.2',
         'PyYAML==6.0.1',
-        'mysqlclient==2.2.3',
+        'mysqlclient==2.2.4',
         'sql_metadata==2.10.0',
         'termcolor==2.4.0',
         'yamlordereddictloader==0.4.2'