[MacPorts] #62174: cmake 3.19.3 tries to use sphinx-build-3.6

[MacPorts]

#62174: cmake 3.19.3 tries to use sphinx-build-3.6
------------------------+--------------------
 Reporter:  EJFielding  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.4
 Keywords:              |       Port:  cmake
------------------------+--------------------
 I am trying to do the usual port upgrade outdated and the `cmake` build is
 failing. I see in the log file that it is using `--sphinx-
 build=/opt/local/bin/sphinx-build-3.6` but I don't have that installed. I
 tried explicitly selecting the 3.7 Sphinx with `port select --set sphinx
 py37-sphinx`, cleaning cmake, and building again, but it still looks for
 the wrong version.

 I attach the log file.

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Ticket URL: <https://trac.macports.org/ticket/62174>
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