[MacPorts] #57094: py-language-server: update to version 0.21.0

[MacPorts]

#57094: py-language-server: update to version 0.21.0
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  Reporter:  reneeotten          |      Owner:  seanfarley
      Type:  update              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  py-language-server  |
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Comment (by reneeotten):

 see [https://github.com/macports/macports-ports/pull/2538 this PR]

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Ticket URL: <https://trac.macports.org/ticket/57094#comment:3>
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