Update M.E.AI to 9.1.0-preview.1.25064.3

Author: stephentoub

LLama/LLamaSharp.csproj

@@ -50,7 +50,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0" />
-    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.0.1-preview.1.24570.5" />
+    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.1.0-preview.1.25064.3" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.0" />
     <PackageReference Include="System.Numerics.Tensors" Version="9.0.0" />
   </ItemGroup>