Update System.Text.Json to 8.0.5

Fixes #316 (pending a release)

Signed-off-by: Jon Skeet <[email protected]>

Author: jskeet

Directory.Packages.props

@@ -16,7 +16,7 @@
  		<PackageVersion Include="Nullable" Version="1.3.1" />
  		<PackageVersion Include="System.Memory" Version="4.5.5" />
  		<PackageVersion Include="System.Text.Encodings.Web" Version="8.0.0" />
- 		<PackageVersion Include="System.Text.Json" Version="8.0.4" />
+ 		<PackageVersion Include="System.Text.Json" Version="8.0.5" />
  		<PackageVersion Include="xunit" Version="2.9.0" />
  		<PackageVersion Include="xunit.runner.console" Version="2.9.0" />
  		<PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />