Requirements: Replace MySQL-python with mysqlclient

https://pypi.org/project/mysqlclient/

requirements/prod.txt

@@ -16,7 +16,8 @@ flask-socketio==3.0.2
 Flask-SQLAlchemy==2.2
 psycopg2==2.7.1
 SQLAlchemy==1.1.9
-MySQL-python==1.2.5
+# MySQL-python==1.2.5
+mysqlclient==1.3.13
 marshmallow==2.13.5
 
 # Migrations