Upgraded Kafka nuget package

Author: stidsborg

ServiceBuses/Kafka/Cleipnir.Flows.Kafka.Tests/Cleipnir.Flows.Kafka.Tests.csproj

@@ -8,7 +8,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Confluent.Kafka" Version="2.8.0" />
+        <PackageReference Include="Confluent.Kafka" Version="2.9.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0"/>
         <PackageReference Include="MSTest" Version="3.8.3"/>
     </ItemGroup>