Fix MessagePack high severity vulnerability (#14079)

Pin MessagePack to 3.1.7 to resolve NU1903 error for known vulnerability
in transitive dependency 2.5.192 brought in by Aspire packages.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SergeyMenshykh

dotnet/Directory.Packages.props

@@ -13,6 +13,7 @@
     <PackageVersion Include="CommunityToolkit.Aspire.Hosting.Dapr" Version="9.9.0" />
     <PackageVersion Include="CommunityToolkit.Aspire.Hosting.NodeJS.Extensions" Version="9.9.0" />
     <PackageVersion Include="Aspire.Hosting.Azure.Search" Version="13.0.0" />
+    <PackageVersion Include="MessagePack" Version="3.1.7" /> <!-- Transitive dependency of Aspire pinned to newer version due to vulnerability in 2.5.192 -->
     <PackageVersion Include="AWSSDK.BedrockAgent" Version="4.0.7.5" />
     <PackageVersion Include="AWSSDK.BedrockAgentRuntime" Version="4.0.8.5" />
     <PackageVersion Include="AWSSDK.BedrockRuntime" Version="4.0.14.5" />

dotnet/samples/Demos/AgentFrameworkWithAspire/ChatWithAgent.AppHost/ChatWithAgent.AppHost.csproj

@@ -22,6 +22,7 @@
     <PackageReference Include="Aspire.Hosting.AppHost" />
     <PackageReference Include="Aspire.Hosting.Azure.CognitiveServices" />
     <PackageReference Include="Aspire.Hosting.Azure.Search" />
+    <PackageReference Include="MessagePack" /> <!-- Override vulnerable transitive dependency (2.5.192) from Aspire packages -->
   </ItemGroup>
 
 </Project>

dotnet/samples/Demos/ProcessFrameworkWithAspire/ProcessFramework.Aspire/ProcessFramework.Aspire.AppHost/ProcessFramework.Aspire.AppHost.csproj

@@ -14,6 +14,7 @@
 
   <ItemGroup>
     <PackageReference Include="Aspire.Hosting.AppHost" />
+    <PackageReference Include="MessagePack" /> <!-- Override vulnerable transitive dependency (2.5.192) from Aspire packages -->
   </ItemGroup>
 
   <ItemGroup>

dotnet/samples/Demos/ProcessFrameworkWithSignalR/src/ProcessFramework.Aspire.SignalR.AppHost/ProcessFramework.Aspire.SignalR.AppHost.csproj

@@ -18,6 +18,7 @@
     <PackageReference Include="Aspire.Hosting.NodeJs" />
     <PackageReference Include="CommunityToolkit.Aspire.Hosting.Dapr" />
     <PackageReference Include="CommunityToolkit.Aspire.Hosting.NodeJS.Extensions" />
+    <PackageReference Include="MessagePack" /> <!-- Override vulnerable transitive dependency (2.5.192) from Aspire packages -->
   </ItemGroup>
 
   <ItemGroup>