[MacPorts] #50097: rust: bump version to 1.5.0

[MacPorts]

#50097: rust: bump version to 1.5.0
-----------------------------------+--------------------------------
 Reporter:  nickolas.fotopoulos@…  |      Owner:  macports-tickets@…
     Type:  update                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.3.4
 Keywords:  haspatch               |       Port:  lang/rust
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 The rust project is releasing new versions quickly. The latest stable
 version now is 1.5.0. I made an attempt at just bumping the version and
 hashes in the Portfile without touching the stage 0 section and it seems
 to work for me completely.

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Ticket URL: <https://trac.macports.org/ticket/50097>
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