rust-toolchain: Update

[alexdewar]

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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.20%. Comparing base (bae744e) to head (e1b1b64).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1046   +/-   ##
=======================================
  Coverage   81.20%   81.20%           
=======================================
  Files          53       53           
  Lines        7269     7269           
  Branches     7269     7269           
=======================================
  Hits         5903     5903           
  Misses       1071     1071           
  Partials      295      295           

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