[MacPorts] #56649: Update Mercurial from 4.5.3 -> 4.6.1

[MacPorts]

#56649: Update Mercurial from 4.5.3 -> 4.6.1
--------------------------+-------------------------------
  Reporter:  josephsacco  |      Owner:  (none)
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.2
Resolution:               |   Keywords:  mercurial, update
      Port:  mercurial    |
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Changes (by josephsacco):

 * Attachment "Portfile.diff" added.

 Portfile diff

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Ticket URL: <https://trac.macports.org/ticket/56649>
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