[MacPorts] #47143: pypi2port: use ${version} in distname

[MacPorts]

#47143: pypi2port: use ${version} in distname
-------------------------+-----------------------
 Reporter:  jmr@…        |      Owner:  gaurav@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  pypi2port
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 Currently, the distname line is written like this:
 {{{
 distname            foo-1.2.0
 }}}
 It would be better to do
 {{{
 distname            foo-${version}
 }}}
 so the version only has to be updated in one place.

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Ticket URL: <https://trac.macports.org/ticket/47143>
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