MFH: r552757
databases/mysq56-{client, server}: Update to latest release 5.6.50
Full Changelog: https://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-50.html
Sponsored by: Netzkommune GmbH
Security: 4fba07ca-13aa-11eb-b31e-d4c9ef517024
Approved by: ports-secteam (with hat)