[MacPorts] #36231: upgrade mercurial to 2.3.1

[MacPorts]

#36231: upgrade mercurial to 2.3.1
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 Reporter:  kuba@…  |      Owner:  macports-tickets@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.1.2
 Keywords:          |       Port:
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Ticket URL: <https://trac.macports.org/ticket/36231>
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