update check_heterogeneity_bias()

[strengejacke]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.52%. Comparing base (e138366) to head (74cb000).
Report is 11 commits behind head on main.

Files	Patch %	Lines
R/check_heterogeneity_bias.R	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #765      +/-   ##
==========================================
+ Coverage   58.05%   58.52%   +0.46%     
==========================================
  Files          88       88              
  Lines        6564     6597      +33     
==========================================
+ Hits         3811     3861      +50     
+ Misses       2753     2736      -17     

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