Bump System.Json from 4.7.0 to 4.7.1

Bumps [System.Json](https://github.com/dotnet/corefx) from 4.7.0 to 4.7.1.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

src/Simplify.Web.Postman/Simplify.Web.Postman.csproj

@@ -20,6 +20,6 @@
 	</PropertyGroup>
 	<ItemGroup>
 		<PackageReference Include="Simplify.Web" Version="4.1.0" />
-		<PackageReference Include="System.Json" Version="4.7.0" />
+		<PackageReference Include="System.Json" Version="4.7.1" />
 	</ItemGroup>
 </Project>