Fix untyped BulkSet deserialization

[danielcweber]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.28%. Comparing base (46a49b9) to head (60e3dfb).
Report is 2 commits behind head on 12.x.

Files with missing lines	Patch %	Lines
...wtonsoftJson/Converters/BulkSetConverterFactory.cs	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             12.x    #1867      +/-   ##
==========================================
+ Coverage   82.24%   82.28%   +0.03%     
==========================================
  Files         260      260              
  Lines        7104     7107       +3     
  Branches     1610     1612       +2     
==========================================
+ Hits         5843     5848       +5     
+ Misses        546      545       -1     
+ Partials      715      714       -1     

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