[MacPorts] #70023: gtkmm @3.24.9: update to 4.0

[MacPorts]

#70023: gtkmm @3.24.9: update to 4.0
-----------------------------+----------------------
  Reporter:  andrew-goldtux  |      Owner:  dbevans
      Type:  update          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.9.3
Resolution:                  |   Keywords:
      Port:  gtkmm           |
-----------------------------+----------------------
Changes (by jmroot):

 * status:  new => assigned
 * owner:  (none) => dbevans


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Ticket URL: <https://trac.macports.org/ticket/70023#comment:2>
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