Fix C# 8 language issue with target type new expression

[jamescourtney]

No description provided.

[codecov]

Codecov Report

Merging #353 (08239df) into main (359b753) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   96.41%   96.41%           
=======================================
  Files         111      111           
  Lines        8563     8563           
  Branches      803      803           
=======================================
  Hits         8256     8256           
  Misses        204      204           
  Partials      103      103           

Impacted Files	Coverage Δ
...tSharp/Serialization/DeserializeClassDefinition.cs	100.00% <100.00%> (ø)

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