[MacPorts] #57650: Update swig-ruby to ruby25

[MacPorts]

#57650: Update swig-ruby to ruby25
------------------------+-----------------------
 Reporter:  mouse07410  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  swig-ruby
------------------------+-----------------------
 {{{
 $ port info swig-ruby
 swig-ruby @3.0.12_1 (devel)
 Variants:             ruby186, ruby187, ruby19, ruby20, ruby21, ruby22,
 [+]ruby23, ruby24,
                       universal
 . . . . .
 $ port info ruby25
 ruby25 @2.5.3 (lang, ruby)
 Variants:             doc, gmp, jemalloc, relative, universal
 . . . . .
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57650>
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