Add 8.1.1 changelog entry from stable branch

[alchemycms-bot]

Syncs changelog entry from stable branch release to main.

This ensures tools like Dependabot can see the changelog for this release.

This PR was automatically created by the post-release workflow.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (4fdc466) to head (dec4ab2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3674   +/-   ##
=======================================
  Coverage   97.48%   97.48%           
=======================================
  Files         314      314           
  Lines        8285     8285           
=======================================
  Hits         8077     8077           
  Misses        208      208           

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