fix: add dependency for moq

Author: AlexDaines

extensions/test/BedrockMEAITests/BedrockMEAITests.NetFramework.csproj

@@ -19,6 +19,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.9.0" />
+    <PackageReference Include="Moq" Version="4.8.3" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
   </ItemGroup>