Bump Newtonsoft.Json from 9.0.1 to 13.0.1 in /Vonage (#286)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 9.0.1 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@9.0.1...13.0.1)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Vonage/Vonage.csproj

@@ -59,7 +59,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.2" />
     <PackageReference Include="jose-jwt" Version="2.3.*" />
     <PackageReference Include="System.Collections.Immutable" Version="1.2.*" />
-    <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
   </ItemGroup>
@@ -69,7 +69,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.2" />
     <PackageReference Include="jose-jwt" Version="2.3.*" />
     <PackageReference Include="System.Collections.Immutable" Version="1.2.*" />
-    <PackageReference Include="Newtonsoft.Json" Version="9.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="System.Diagnostics.Process" Version="4.1.*" />