[MacPorts] #69809: oxygen-gtk2: update to 1.4.6

[MacPorts]

#69809: oxygen-gtk2: update to 1.4.6
--------------------------+-------------------------
 Reporter:  barracuda156  |      Owner:  RJVB
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.9.3
 Keywords:                |       Port:  oxygen-gtk2
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 Most of the downstream distributions are at 1.4.6 now. Could we update it
 too?

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Ticket URL: <https://trac.macports.org/ticket/69809>
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