[MacPorts] #55487: mysql57: Update to 5.7.21 (was: mysql57: Update to 5.7.20)

[MacPorts]

#55487: mysql57: Update to 5.7.21
-------------------------+---------------------
  Reporter:  ryandesign  |      Owner:  pixilla
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mysql57     |
-------------------------+---------------------
Description changed by ryandesign:

Old description:

> {{{
> $ port livecheck mysql57
> mysql57 seems to have been updated (port version: 5.7.17, new version:
> 5.7.20)
> }}}

New description:

 {{{
 $ port livecheck mysql57
 mysql57 seems to have been updated (port version: 5.7.17, new version:
 5.7.21)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55487#comment:1>
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