chore(deps): update dependency newtonsoft.json to v13

Author: mend-for-github-com[bot]

samples/client/petstore/csharp/SwaggerClientNetCoreProject/src/IO.Swagger/IO.Swagger.csproj

@@ -20,7 +20,7 @@
   <ItemGroup>
     <PackageReference Include="FubarCoder.RestSharp.Portable.Core" Version="4.0.7" />
     <PackageReference Include="FubarCoder.RestSharp.Portable.HttpClient" Version="4.0.7" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageReference Include="JsonSubTypes" Version="1.2.0" />
   </ItemGroup>
 

samples/server/petstore/aspnetcore/src/IO.Swagger/IO.Swagger.csproj

@@ -14,7 +14,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.3"/>
     <PackageReference Include="Swashbuckle.AspNetCore" Version="1.1.0"/>
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3"/>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4"/>
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.1"/>
   </ItemGroup>
   <ItemGroup>