[MacPorts] #55487: mysql57: Update to 5.7.20

[MacPorts]

#55487: mysql57: Update to 5.7.20
------------------------+---------------------
 Reporter:  ryandesign  |      Owner:  pixilla
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  mysql57
------------------------+---------------------
 {{{
 $ port livecheck mysql57
 mysql57 seems to have been updated (port version: 5.7.17, new version:
 5.7.20)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55487>
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