[MacPorts] #39642: py-rdflib: update to 4.0.1

[MacPorts]

#39642: py-rdflib: update to 4.0.1
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  Reporter:  jmr@…      |      Owner:  eikeon@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  py-rdflib  |
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Comment (by macsforever2000@…):

 I have a Portfile that installs py-rdflib 4.1.1 but it seems to require
 py-isodate which currently does not exist on Macports. I'm looking into
 creating a port for it.

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Ticket URL: <https://trac.macports.org/ticket/39642#comment:6>
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