[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 jonesc@…):

 I've run some checks, and I don't think anything needs to change. python27
 is picked automatically already, even if a newer python3x port is
 installed. So just adding the port dependency is enough to make sure it is
 found and used.

 Chris

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Ticket URL: <https://trac.macports.org/ticket/49677#comment:5>
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