Use DefaultJsonSerializer for BodyAsJson-Response

[StefH]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 79.08497% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.06%. Comparing base (1e591d5) to head (4c0234f).

Files with missing lines	Patch %	Lines
...ock.Net.Minimal/Owin/Mappers/OwinResponseMapper.cs	79.47%	31 Missing ⚠️
...Mock.Net.Minimal/Owin/WireMockMiddlewareOptions.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1448      +/-   ##
==========================================
- Coverage   36.30%   36.06%   -0.25%     
==========================================
  Files         157      157              
  Lines       39927    39568     -359     
==========================================
- Hits        14496    14270     -226     
+ Misses      24852    24714     -138     
- Partials      579      584       +5     

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