[MacPorts] #63930: py-keyring doesn't work at python3.10

[MacPorts]

#63930: py-keyring doesn't work at python3.10
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  Reporter:  catap       |      Owner:  reneeotten
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py-keyring  |
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Changes (by jmroot):

 * owner:  (none) => reneeotten
 * status:  new => assigned
 * port:   => py-keyring


Comment:

 Guess it's using `importlib_metadata` unconditionally rather than using
 `importlib.metadata` from the stdlib when available. So the dependency is
 needed with all python versions, not just old ones.

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Ticket URL: <https://trac.macports.org/ticket/63930#comment:1>
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