docs: match MSRV with Cargo.toml contents

[coryan]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.86%. Comparing base (45caaa9) to head (a904d7b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1772   +/-   ##
=======================================
  Coverage   89.86%   89.86%           
=======================================
  Files          35       35           
  Lines       13769    13769           
=======================================
  Hits        12374    12374           
  Misses       1395     1395           

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