[MacPorts] #57053: py-sphinx: update to 1.7.8

[MacPorts]

#57053: py-sphinx: update to 1.7.8
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 Reporter:  pmetzger  |      Owner:  jmroot
     Type:  update    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  py-sphinx
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 py-sphinx has been bumped to 1.7.8, we should update our port.

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Ticket URL: <https://trac.macports.org/ticket/57053>
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