[MacPorts] #62883: Kindly request update pipx from v0.15.5.1 to v0.16.2.1

[MacPorts]

#62883: Kindly request update pipx from v0.15.5.1 to v0.16.2.1
-----------------------+--------------------
 Reporter:  NickFabry  |      Owner:  (none)
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.4
 Keywords:             |       Port:  pipx
-----------------------+--------------------
 pipx v0.15.5.1 dates from 2020-08; v0.16.2.1 has many enhancements,
 including working with python3.9.

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Ticket URL: <https://trac.macports.org/ticket/62883>
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