[MacPorts] #64773: py-hyperlink: Update to 21.0.0

[MacPorts]

#64773: py-hyperlink: Update to 21.0.0
------------------------+---------------------------------
 Reporter:  ryandesign  |      Owner:  MarcusCalhoun-Lopez
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  py-hyperlink
------------------------+---------------------------------
 Please update py-hyperlink to 21.0.0 or later:
 {{{
 $ port livecheck py-hyperlink
 py-hyperlink seems to have been updated (port version: 19.0.0, new
 version: 21.0.0)
 }}}
 To fix [https://github.com/twisted/treq/issues/345 test failure of py-
 treq].

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Ticket URL: <https://trac.macports.org/ticket/64773>
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