Bump Apache.Avro from 1.10.0 to 1.11.0 in /csharp/avro/samples (#18)

Bumps [Apache.Avro](https://github.com/apache/avro) from 1.10.0 to 1.11.0.
- [Release notes](https://github.com/apache/avro/releases)
- [Commits](https://github.com/apache/avro/compare/release-1.10.0...release-1.11.0)

---
updated-dependencies:
- dependency-name: Apache.Avro
  dependency-type: direct:production
...

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csharp/avro/samples/Microsoft.Azure.Kafka.SchemaRegistry.Avro.Samples.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Apache.Avro" Version="1.10.0" />
+    <PackageReference Include="Apache.Avro" Version="1.11.0" />
     <PackageReference Include="Azure.Core" Version="1.5.0" />
     <PackageReference Include="Azure.Identity" Version="1.2.3" />
     <PackageReference Include="Confluent.Kafka" Version="1.5.1" />