[MacPorts] #58673: struts: update to 2.5.20

[MacPorts]

#58673: struts: update to 2.5.20
---------------------------+--------------------
  Reporter:  chrstphrchvz  |      Owner:  (none)
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  struts        |
---------------------------+--------------------

Comment (by mf2k):

 Just update it to the latest struts 2. No need to have an old version
 around since there are no dependents.

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Ticket URL: <https://trac.macports.org/ticket/58673#comment:1>
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