fix: use default factory to remove shared mutable in State

[Andeshog]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.40%. Comparing base (979d564) to head (1950015).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   89.40%   89.40%           
=======================================
  Files           6        6           
  Lines         500      500           
  Branches      142      142           
=======================================
  Hits          447      447           
  Misses          4        4           
  Partials       49       49           

Flag	Coverage Δ
unittests	89.40% <ø> (ø)

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[github-actions]

🎉 This PR is included in version 1.4.3 🎉

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