[MacPorts] #65591: Update to OpenJDK 15.0.8

[MacPorts]

#65591: Update to OpenJDK 15.0.8
------------------------+--------------------
  Reporter:  breun      |      Owner:  (none)
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  openjdk15  |
------------------------+--------------------

Comment (by breun):

 This was resolved by https://github.com/macports/macports-
 ports/commit/26e7ec342003b78ef3be747b24f6bb48596718fb, but I can't close
 this ticket.

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Ticket URL: <https://trac.macports.org/ticket/65591#comment:1>
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