Address vulnerability (microsoft#2631)

Author: rogerbarreto

dotnet/Directory.Packages.props

@@ -46,6 +46,7 @@
     <PackageVersion Include="System.Text.Json" Version="10.0.0" />
     <PackageVersion Include="System.Threading.Channels" Version="10.0.0" />
     <PackageVersion Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
+    <PackageVersion Include="System.Net.Security" Version="4.3.2" />
     <!-- OpenTelemetry -->
     <PackageVersion Include="OpenTelemetry" Version="1.13.1" />
     <PackageVersion Include="OpenTelemetry.Api" Version="1.13.1" />

dotnet/samples/GettingStarted/AgentProviders/Agent_With_GoogleGemini/Agent_With_GoogleGemini.csproj

@@ -2,18 +2,22 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net10.0</TargetFrameworks>
+    <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
 
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
-    <NoWarn>$(NoWarn);IDE0059</NoWarn>
+    <NoWarn>$(NoWarn);IDE0059;NU1510</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Google.GenAI" />
     <PackageReference Include="Mscc.GenerativeAI.Microsoft" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)' == 'net8.0' or '$(TargetFramework)' == 'net9.0'">
+    <PackageReference Include="System.Net.Security" />
+  </ItemGroup>
+  
   <ItemGroup>
     <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI\Microsoft.Agents.AI.csproj" />
   </ItemGroup>