[MacPorts] #33238: openbabel: update to 2.3.1

[MacPorts]

#33238: openbabel: update  to 2.3.1
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 Reporter:  zach.charlop.powers@…          |       Owner:  macports-tickets@…                   
     Type:  update                         |      Status:  new                                  
 Priority:  Normal                         |   Milestone:                                       
Component:  ports                          |     Version:  2.0.3                                
 Keywords:                                 |        Port:                                       
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 there is a new version of openbabel that suports a few nice new features
 including writing PNG files

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Ticket URL: <https://trac.macports.org/ticket/33238>
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