[MacPorts] #64547: Upgrade re2c to 3.0

[MacPorts]

#64547: Upgrade re2c to 3.0
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 Reporter:  pmetzger  |      Owner:  ryandesign
     Type:  update    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  re2c
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 A new re2c was just released which includes support for generating lexers
 in Rust.

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Ticket URL: <https://trac.macports.org/ticket/64547>
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