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 89.74%. Comparing base (302f558) to head (99d373b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1227   +/-   ##
=======================================
  Coverage   89.74%   89.74%           
=======================================
  Files          57       57           
  Lines        8195     8195           
  Branches     8195     8195           
=======================================
  Hits         7355     7355           
  Misses        544      544           
  Partials      296      296           

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