[MacPorts] #61308: py-torchvision: update to 0.7.0

[MacPorts]

#61308: py-torchvision: update to 0.7.0
--------------------------+----------------------------
 Reporter:  chrstphrchvz  |      Owner:  cjones051073
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  py-torchvision
--------------------------+----------------------------
 [https://github.com/pytorch/vision/releases/tag/v0.7.0 0.7.0] released
 2020-07-28; current version in MacPorts is 0.6.0.

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Ticket URL: <https://trac.macports.org/ticket/61308>
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