[MacPorts] #57851: rust: update to 1.31.1

[MacPorts]

#57851: rust: update to 1.31.1
----------------------+--------------------
 Reporter:  pmetzger  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  rust
----------------------+--------------------
 Rust has been updated to 1.31.1, macports still seems to be on 1.30.1

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Ticket URL: <https://trac.macports.org/ticket/57851>
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