Update .NET MAUI Markup Extensions

## Summary

MAUI 9.0 has introduced new attributes for Markup Extensions. The absence of these attributes produces new Build warnings when apps update to net9.0/ MAUI 9.0.

https://learn.microsoft.com/en-us/dotnet/maui/whats-new/dotnet-9?view=net-maui-9.0#update-xaml-markup-extensions