[MacPorts] #55554: sumo @ 0.31.0 Update to new release

[MacPorts]

#55554: sumo @ 0.31.0 Update to new release
-----------------------+---------------------------------
  Reporter:  lockhart  |      Owner:
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch maintainer
      Port:  sumo      |
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Changes (by lockhart):

 * Attachment "Portfile.diff" added.

 Bump version and checksums. Remove obsolete line of substitution.

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Ticket URL: <https://trac.macports.org/ticket/55554>
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