[MacPorts] #38632: nodejs: improve livecheck

[MacPorts]

#38632: nodejs: improve livecheck
--------------------------+---------------------------------
 Reporter:  ryandesign@…  |      Owner:  ciserlohn@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:  haspatch      |       Port:  nodejs nodejs-devel
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 This patch future-proofs the nodejs and nodejs-devel livecheck, so you
 won't have to updated it with every new branch.

 I also switched to enclosing the livecheck regex in curly braces, since
 there was no variable substitution going on; this removes one level of
 escaping and I think makes the regex more readable.

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Ticket URL: <https://trac.macports.org/ticket/38632>
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