[MacPorts] #58225: uhd: Add python37 variant

[MacPorts]

#58225: uhd: Add python37 variant
--------------------------+-----------------------
  Reporter:  mf2k         |      Owner:  michaelld
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  uhd          |
--------------------------+-----------------------

Comment (by ra1nb0w):

 probably we can deprecate python34 and python35; what do you think?

-- 
Ticket URL: <https://trac.macports.org/ticket/58225#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS