build(deps): bump Newtonsoft.Json in /RouterFunction

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 11.0.2 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@11.0.2...13.0.1)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

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

RouterFunction/RouterFunction.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.24" />
-    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="4.0.5" />
   </ItemGroup>