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

[MacPorts]

#57094: py-language-server: update to version 0.21.0
------------------------+--------------------------------
 Reporter:  reneeotten  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  py-language-server
------------------------+--------------------------------
 {{{
 $ port livecheck
 py-language-server seems to have been updated (port version: 0.17.1, new
 version: 0.21.0)
 }}}
 It's a new dependency for {{{py-spyder-devel}}}, which requires version >=
 0.19.0.

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