[MacPorts] #67265: Update TortoiseHg to 6.4

[MacPorts]

#67265: Update TortoiseHg to 6.4
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 Reporter:  Themanwithoutaplan  |      Owner:  (none)
     Type:  defect              |     Status:  new
 Priority:  Normal              |  Milestone:
Component:  ports               |    Version:  2.8.1
 Keywords:                      |       Port:  tortoisehg
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 The last time I worked on a PR I couldn't get it to build at all. I'm
 happy to try again but would appreciate some help.

 Also, the application name needs fixing: it appears as "Python" in the
 menu bar.

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Ticket URL: <https://trac.macports.org/ticket/67265>
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