refactor(yaml): remove variable underscore

[timreichen]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.28%. Comparing base (6c70fa9) to head (3e1e48c).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_dumper_state.ts	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5741   +/-   ##
=======================================
  Coverage   96.28%   96.28%           
=======================================
  Files         474      474           
  Lines       38383    38383           
  Branches     5578     5578           
=======================================
+ Hits        36957    36958    +1     
+ Misses       1384     1383    -1     
  Partials       42       42           

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