refactor(yaml): move isObject()

[timreichen]

Changes
This PR moves isObject() check to a separate block to avoid double check.

[codecov]

Codecov Report

Attention: Patch coverage is 89.28571% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.28%. Comparing base (7fc1940) to head (074fff7).
Report is 1 commits behind head on main.

Files	Patch %	Lines
yaml/_dumper_state.ts	89.28%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5823   +/-   ##
=======================================
  Coverage   96.27%   96.28%           
=======================================
  Files         479      479           
  Lines       38744    38746    +2     
  Branches     5621     5623    +2     
=======================================
+ Hits        37302    37307    +5     
+ Misses       1399     1396    -3     
  Partials       43       43           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[iuioiua]

Thank you