[MacPorts] #50611: py-mitmproxy update to 0.15

[MacPorts]

#50611: py-mitmproxy update to 0.15
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  Reporter:  macports@…    |      Owner:  petr@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  maintainer haspatch
      Port:  py-mitmproxy  |
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Comment (by petr@…):

 See also #50991.

 py-mitmproxy would need to be updated to version 0.16 in order to fix that
 issue. The sources are no longer published PyPI, so we probably need to
 switch to GitHub.

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Ticket URL: <https://trac.macports.org/ticket/50611#comment:6>
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