[MacPorts] #53404: `port upgrade outdated` changes colours in terminal emulation

[MacPorts]

#53404: `port upgrade outdated` changes colours in terminal emulation
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  Reporter:  ballapete  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:
Resolution:             |   Keywords:
      Port:             |
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Comment (by raimue):

 That answers one part of my question. Is this Terminal.app?

 `TERM=dumb` is not a sane choice. I wonder where this comes from in your
 setup. Usually, it should be `TERM=xterm` or `TERM=xterm-256color`,
 matching the capabilities of the terminal emulator.

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Ticket URL: <https://trac.macports.org/ticket/53404#comment:4>
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