[MacPorts] #43219: Upgrade tmux to 1.9

[MacPorts]

#43219: Upgrade tmux to 1.9
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 Reporter:  justrafi@…  |      Owner:  macports-tickets@…
     Type:  update      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.2.1
 Keywords:  tmux 1.9    |       Port:  tmux
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 Please upgrade tmux to 1.9

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Ticket URL: <https://trac.macports.org/ticket/43219>
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