Remove NJsonSchema reference

Author: emasab

examples/OAuthOIDCAzureIMDS/OAuthOIDCAzureIMDS.csproj

@@ -13,8 +13,4 @@
     <ProjectReference Include="../../src/Confluent.Kafka/Confluent.Kafka.csproj" />
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Include="NJsonSchema" Version="10.8.0" />
-  </ItemGroup>
-
 </Project>

examples/OAuthOIDCAzureIMDS/Program.cs

@@ -23,7 +23,6 @@
 using Confluent.Kafka;
 using Confluent.Kafka.Admin;
 using Confluent.Kafka.SyncOverAsync;
-using Newtonsoft.Json;
 
 /// <summary>
 ///     An example demonstrating how to produce a message to