[MacPorts] #71045: openjdk21-openj9: Minimum OS version is 10.15 but install on older versions, openjdk17-openj9: minimum OS version is 10.14

[MacPorts]

#71045: openjdk21-openj9: Minimum OS version is 10.15 but install on older
versions, openjdk17-openj9: minimum OS version is 10.14
------------------------------------------------+----------------------
  Reporter:  sambthompson                       |      Owner:  breun
      Type:  defect                             |     Status:  assigned
  Priority:  Normal                             |  Milestone:
 Component:  ports                              |    Version:  2.10.2
Resolution:                                     |   Keywords:  mojave
      Port:  openjdk21-openj9 openjdk17-openj9  |
------------------------------------------------+----------------------

Comment (by breun):

 Thanks for pointing this out, I'll check `JVMMinimumSystemVersion` for all
 JDK ports and update as necessary.

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Ticket URL: <https://trac.macports.org/ticket/71045#comment:2>
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