Add feed for dotnet maui 9.0.111. (#5009)

Author: LoopedBard3

NuGet.config

@@ -31,6 +31,8 @@
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
     <add key="dotnet-tools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" />
     <add key="benchmark-dotnet-prerelease" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/benchmark-dotnet-prerelease/nuget/v3/index.json" />
+    <!-- Added manually for .NET 9 MAUI -->
+    <add key="darc-pub-dotnet-maui-7c4f71ad" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-maui-7c4f71ad/nuget/v3/index.json" />
     <!-- Added manually for .NET 8 MAUI -->
     <add key="darc-pub-dotnet-maui-a33a875e" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-maui-a33a875e/nuget/v3/index.json" />
     <!-- Added manually for dotnet/runtime 8.0.18 -->