Update System.Text.Json requirement from 4.7.* to 5.0.*

Updates the requirements on [System.Text.Json](https://github.com/dotnet/runtime) to permit the latest version.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits/v5.0.2)

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

Author: dependabot[bot]

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

@@ -26,6 +26,6 @@
 	</PropertyGroup>
 	<ItemGroup>
 		<PackageReference Include="Simplify.Web" Version="4.4.*" />
-		<PackageReference Include="System.Text.Json" Version="4.7.*" />
+		<PackageReference Include="System.Text.Json" Version="5.0.*" />
 	</ItemGroup>
 </Project>