Downgrade mysqlclient to 1.3.14 (#4165)
Downgrade mysqlclient to 1.3.14 (#4165)

Closes #4164.
denisov-vlad/redash,getredash/redash,alexanderlz/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash,denisov-vlad/redash,denisov-vlad/redash,getredash/redash,denisov-vlad/redash,getredash/redash,getredash/redash,alexanderlz/redash,getredash/redash