[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:  michaelld
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:  fixed       |   Keywords:
      Port:  cmake       |
-------------------------+-----------------------

Comment (by michaelld):

 Thank you @Blair for the quick fixup!

-- 
Ticket URL: <https://trac.macports.org/ticket/62174#comment:9>
MacPorts <https://www.macports.org/>
Ports system for macOS