Update System.Text.Json requirement from 5.0.* to 6.0.*

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](dotnet/runtime@v5.0.0...v6.0.1)

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
...

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

Author: dependabot[bot]

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

@@ -25,7 +25,7 @@
 	</PropertyGroup>
 	<ItemGroup>
 		<PackageReference Include="Simplify.Web" Version="4.5.*" />
-		<PackageReference Include="System.Text.Json" Version="5.0.*" />
+		<PackageReference Include="System.Text.Json" Version="6.0.*" />
 	</ItemGroup>
 	<ItemGroup>
 		<None Include="..\..\images\icon.png" Pack="true" Visible="false" PackagePath="" />