[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:
 Keywords:               |       Port:  uhd
-------------------------+-----------------------
 Please add {{{+python37}}} to uhd(-devel).

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Ticket URL: <https://trac.macports.org/ticket/58225>
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