[MacPorts] #45249: mercurial: update to version 3.1.2

[MacPorts]

#45249: mercurial: update to version 3.1.2
----------------------+--------------------------------
 Reporter:  sierkb@…  |      Owner:  macports-tickets@…
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.1
 Keywords:  update    |       Port:  mercurial
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 mercurial: update to newest version (3.1.2)

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Ticket URL: <https://trac.macports.org/ticket/45249>
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