[MacPorts] #64857: icu configure fails on macOS 12.3

[MacPorts]

#64857: icu configure fails on macOS 12.3
------------------------+--------------------
 Reporter:  lunixbochs  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.2
 Keywords:              |       Port:  icu
------------------------+--------------------
 macOS 12.3 removes Python 2 from the system. I had to `port edit icu` and
 comment out `configure.python /usr/bin/python` for icu to install, as
 /usr/bin/python is no longer present. I assume the proper fix would be to
 depend on a specific Python version present in macports.

 I tried and failed to make the python27 block lower in the Portfile
 override the Python version.

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Ticket URL: <https://trac.macports.org/ticket/64857>
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