Fix JsonSerializerDataContractResolver so that it handles square arrays correctly

[ozziepeeps]

Pull Request

The issue or feature being addressed

Fix JsonSerializerDataContractResolver so that it handles square arrays correctly
Fixes #3244

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.57%. Comparing base (2826dd9) to head (290229e).

Files with missing lines	Patch %	Lines
...emaGenerator/JsonSerializerDataContractResolver.cs	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3245      +/-   ##
==========================================
- Coverage   83.62%   83.57%   -0.05%     
==========================================
  Files          76       76              
  Lines        3182     3185       +3     
  Branches      538      539       +1     
==========================================
+ Hits         2661     2662       +1     
- Misses        521      523       +2     

Flag	Coverage Δ
Linux	83.57% <33.33%> (-0.05%)	⬇️
Windows	83.57% <33.33%> (-0.05%)	⬇️
macOS	83.57% <33.33%> (-0.05%)	⬇️

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[ozziepeeps]

@martincostello hopefully this is a quick review for you! TIA!

[martincostello]

Thanks!