Fix Android DI build by adding AndroidX.Core package

Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>
Agent-Logs-Url: https://github.com/GeneralLibrary/GeneralUpdate.Maui/sessions/685b3983-915d-44f0-9172-20937346cd51

Author: Copilot

src/GeneralUpdate.Maui.Android/GeneralUpdate.Maui.Android.csproj

@@ -13,5 +13,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.0" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="10.0.0" />
+    <PackageReference Include="Xamarin.AndroidX.Core" Version="1.13.1.1" Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'" />
   </ItemGroup>
 </Project>