[MacPorts] #38471: Update: py-icalendar to 3.3

[MacPorts]

#38471: Update: py-icalendar to 3.3
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 Reporter:  brian.andrew@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:
 Keywords:  haspatch        |       Port:  py-icalendar
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 This updates py-icalendar to 3.3 including removing support for python <
 2.6 and updates the livecheck to actually work correctly.

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Ticket URL: <https://trac.macports.org/ticket/38471>
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