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

[MacPorts]

#38471: Update: py-icalendar to 3.3
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  Reporter:  brian.andrew@…  |      Owner:  deric@…
      Type:  update          |     Status:  closed
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:  fixed           |   Keywords:  haspatch
      Port:  py-icalendar    |
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Comment (by egall@…):

 this update caused my MacPorts to fail to parse the py-icalendar portfile
 after my latest selfupdate:
 {{{
 Failed to parse file python/py-icalendar/Portfile: can't read "realname":
 no such variable
 }}}

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Ticket URL: <https://trac.macports.org/ticket/38471#comment:3>
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