Run tests on 64-bit processes

[AArnott]

• Run tests on 64-bit process
• Update sln file

[codecov-commenter]

Codecov Report

Merging #713 (6f677b3) into main (b5ba0c1) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #713      +/-   ##
==========================================
- Coverage   91.52%   91.50%   -0.02%     
==========================================
  Files          60       60              
  Lines        5182     5182              
==========================================
- Hits         4743     4742       -1     
- Misses        439      440       +1     

Impacted Files	Coverage Δ
src/StreamJsonRpc/MessageHandlerBase.cs	93.97% <0.00%> (-2.41%)	⬇️
src/StreamJsonRpc/Reflection/RpcTargetInfo.cs	92.01% <0.00%> (-0.77%)	⬇️
src/StreamJsonRpc/JsonRpc.cs	94.13% <0.00%> (+0.40%)	⬆️

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