[MacPorts] #65591: Update to OpenJDK 15.0.8

[MacPorts]

#65591: Update to OpenJDK 15.0.8
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 Reporter:  breun   |      Owner:  (none)
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  openjdk15
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 The `openjdk15` port should be updated to 15.0.8:
 https://github.com/openjdk/jdk15u/releases/tag/jdk-15.0.8-ga

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