[MacPorts] #67645: streamlink: update to 6.0.1 (was: streamlink: update to 5.5.1)

[MacPorts]

#67645: streamlink: update to 6.0.1
-------------------------+--------------------
  Reporter:  mohd-akram  |      Owner:  (none)
      Type:  update      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  streamlink  |
-------------------------+--------------------

Comment (by ryandesign):

 6.0.1 was released last week. The port is currently at version 1.7.0 which
 was released in 2020. Given the large jump in version numbers, this may be
 a nontrivial update.

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Ticket URL: <https://trac.macports.org/ticket/67645#comment:1>
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