Update Microsoft.Extensions.AI* packages to latest versions (#1093)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

Author: Copilot

Directory.Packages.props

@@ -4,7 +4,7 @@
     <System8Version>8.0.22</System8Version>
     <System9Version>9.0.11</System9Version>
     <System10Version>10.0.1</System10Version>
-    <MicrosoftExtensionsVersion>10.1.0</MicrosoftExtensionsVersion>
+    <MicrosoftExtensionsVersion>10.1.1</MicrosoftExtensionsVersion>
   </PropertyGroup>
 
   <!-- Product dependencies shared -->
@@ -65,13 +65,13 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageVersion>
-    <PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="10.1.0-preview.1.25608.1" />
+    <PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="10.1.1-preview.1.25612.2" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="$(System10Version)" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="$(System10Version)" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="$(System10Version)" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Console" Version="$(System10Version)" />
     <PackageVersion Include="Microsoft.Extensions.Options" Version="$(System10Version)" />
-    <PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="$(MicrosoftExtensionsVersion)" />
+    <PackageVersion Include="Microsoft.Extensions.TimeProvider.Testing" Version="10.1.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="OpenTelemetry" Version="1.14.0" />