rust-toolchain: Update

[rse-ci-imperial]

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

Github Actions will not run workflows on pull requests which are opened by a GitHub Action.

For examples on how to run an workflows on this pr, please go to the readme.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.29%. Comparing base (a332ac1) to head (6798d67).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1504   +/-   ##
=======================================
  Coverage   90.29%   90.29%           
=======================================
  Files          60       60           
  Lines        8645     8645           
  Branches     8645     8645           
=======================================
  Hits         7806     7806           
  Misses        525      525           
  Partials      314      314           

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