chore: prepare release 6.0.4

[phil-davis]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.31%. Comparing base (5b52d22) to head (b8a828d).
⚠️ Report is 3 commits behind head on 6.0.

Additional details and impacted files

@@            Coverage Diff            @@
##                6.0     #265   +/-   ##
=========================================
  Coverage     94.31%   94.31%           
  Complexity      260      260           
=========================================
  Files            15       15           
  Lines           880      880           
=========================================
  Hits            830      830           
  Misses           50       50           

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