[MacPorts] #63283: Update rust-analyzer to 2021-07-19 (or newer)

[MacPorts]

#63283: Update rust-analyzer to 2021-07-19 (or newer)
----------------------+---------------------------
 Reporter:  pmetzger  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  rust-analyzer
----------------------+---------------------------
 rust-analyzer is quite fast moving; the latest is many months newer than
 what is currently in macports. As of this writing, it is 2021-07-19 but
 there's a new version about weekly.

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Ticket URL: <https://trac.macports.org/ticket/63283>
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