[MacPorts] #65426: py39-pyqt5 fails to (update) build on OS 11

[MacPorts]

#65426: py39-pyqt5 fails to (update) build on OS 11
---------------------------+------------------------
 Reporter:  StanSanderson  |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.7.2
 Keywords:                 |       Port:  py39-pyqt5
---------------------------+------------------------
 requested py39-pyqt5 update  5.15.6_0 < 5.15.7_0 has failed, with related
 ports also failing to update for the past week (or two). Using OS 11 Big
 Sur on iMac, same problem on MacBook Air, also OS 11, same ports
 installed. I'm 82, code is a mystery- was hoping for the problem to
 resolve.

 Log attached

 Following ports are affected:
 py39-poppler-qt5               21.1.0_0 < 21.1.0_1
 py39-pyqt5                     5.15.6_0 < 5.15.7_0
 py39-pyqt5-webengine           5.15.5_0 < 5.15.6_0
 py310-poppler-qt5              21.1.0_0 < 21.1.0_1
 py310-pyqt5                    5.15.6_0 < 5.15.7_0
 py310-pyqt5-webengine          5.15.5_0 < 5.15.6_0

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Ticket URL: <https://trac.macports.org/ticket/65426>
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