[MacPorts] #35617: update py-mercurial_keyring to 0.5.2

[MacPorts]

#35617: update py-mercurial_keyring to 0.5.2
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 Reporter:  peter.linss@…       |       Owner:  macports-tickets@…                   
     Type:  update              |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  2.1.2                                
 Keywords:                      |        Port:                                       
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 The current version 0.5 isn't compatible with the current mercurial 2.3

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Ticket URL: <https://trac.macports.org/ticket/35617>
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