[MacPorts] #48333: nettle: update to 3.1.1

[MacPorts]

#48333: nettle: update to 3.1.1
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 Reporter:  ryandesign@…  |      Owner:  ryandesign@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  nettle
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 nettle should be updated to the latest version, 3.1.1, but [ticket:48328
 gnutls needs to be updated to 3.3.16 first] because that is the first
 version compatible with nettle 3.

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Ticket URL: <https://trac.macports.org/ticket/48333>
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