Bump mysqlclient from 2.2.1 to 2.2.3 (#315)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 Brotli==1.1.0
 faust-cchardet==2.1.19
-mysqlclient==2.2.1
+mysqlclient==2.2.3
 psycopg2==2.9.9