MFH: r522041

www/py-django[22|30]: Unbreak with MySQL, switch to py-mysqlclient

According to official docs, mysqlclient >=1.3.13 is the recommended
choice instead of outdated pyMySQLdb

PR: 243077
Submitted by: fluffy
Approved by: sunpoet (maintaner, python@)

Approved by: ports-secteam (joneum)