Add usage of STJ for .net 8

[adamhathcock]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 72.94118% with 23 lines in your changes missing coverage. Please review.

Project coverage is 65.04%. Comparing base (715bb72) to head (b95129f).

Files with missing lines	Patch %	Lines
...dk/Serialisation/V2/Receive/ObjectDeserializer2.cs	65.62%	15 Missing and 7 partials ⚠️
...dk/Serialisation/V2/Receive/DictionaryConverter.cs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #168       +/-   ##
===========================================
+ Coverage   52.73%   65.04%   +12.31%     
===========================================
  Files         236      253       +17     
  Lines        9281     9991      +710     
  Branches     1115     1135       +20     
===========================================
+ Hits         4894     6499     +1605     
+ Misses       4134     3167      -967     
- Partials      253      325       +72     

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