Start development of version 8.4.0.dev

[alchemycms-bot]

Automated version bump after 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 98.62%. Comparing base (ce1aa1a) to head (4fdbc87).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #285   +/-   ##
=======================================
  Coverage   98.62%   98.62%           
=======================================
  Files          11       11           
  Lines         291      291           
=======================================
  Hits          287      287           
  Misses          4        4           

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