rust-toolchain: Update

[rse-ci-imperial]

Automatic change by the update-rust-toolchain Github Action.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.85%. Comparing base (d24583f) to head (da0b3a9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1536   +/-   ##
=======================================
  Coverage   90.85%   90.85%           
=======================================
  Files          61       61           
  Lines        9039     9039           
  Branches     9039     9039           
=======================================
  Hits         8212     8212           
  Misses        508      508           
  Partials      319      319           

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