[MacPorts] #49677: xrootd: update to 4.2.3

[MacPorts]

#49677: xrootd: update to 4.2.3
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  Reporter:  jonesc@…  |      Owner:  macports-tickets@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch maintainer
      Port:  xrootd    |
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Comment (by ryandesign@…):

 Are you sure you haven't used "sudo port select python python27"?

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Ticket URL: <https://trac.macports.org/ticket/49677#comment:6>
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