[MacPorts] #46400: dot2tex @2.8.7_3: remove Python variants

[MacPorts]

#46400: dot2tex @2.8.7_3: remove Python variants
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 Reporter:  larryv@…     |      Owner:  snc@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  dot2tex
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 Since Python 2.5 and 2.6 are deprecated, I think we might as well make
 `dot2tex` use Python 2.7 unconditionally.

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Ticket URL: <https://trac.macports.org/ticket/46400>
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