[MacPorts] #61239: glances: update to 3.1.5

[MacPorts]

#61239: glances: update to 3.1.5
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  Reporter:  lhaeger  |      Owner:  g5pw
      Type:  update   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  glances  |
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Comment (by ryandesign):

 While you do this update, you should switch to python 3.8 and add a
 symlink for the manpage (see #61240).

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Ticket URL: <https://trac.macports.org/ticket/61239#comment:4>
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