Fix build

- Add package feeds for Aspire for .NET 9.
- Fix incorrect container base image for .NET 9.

NuGet.config

@@ -2,14 +2,22 @@
 <configuration>
   <packageSources>
     <clear />
+    <add key="aspire" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />
     <add key="aspnet-contrib" value="https://www.myget.org/F/aspnet-contrib/api/v3/index.json" />
+    <add key="azure-sdk-for-net" value="https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-net/nuget/v3/index.json" />
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
   </packageSources>
   <packageSourceMapping>
+    <packageSource key="aspire">
+      <package pattern="Aspire.*" />
+    </packageSource>
     <packageSource key="aspnet-contrib">
       <package pattern="AspNet.Security.OAuth.*" />
     </packageSource>
+    <packageSource key="azure-sdk-for-net">
+      <package pattern="Azure.*" />
+    </packageSource>
     <packageSource key="dotnet-eng">
       <package pattern="Microsoft.DotNet.XliffTasks" />
     </packageSource>

src/LondonTravel.Site.AppHost/LondonTravel.Site.AppHost.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <IsAspireHost>true</IsAspireHost>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Aspire.Hosting.AppHost" />

src/LondonTravel.Site/LondonTravel.Site.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
   <PropertyGroup>
     <!-- TODO Remove if https://github.com/dotnet/sdk/issues/40500 implemented or when no longer only in nightly -->
-    <ContainerBaseImage>mcr.microsoft.com/dotnet/nightly/runtime-deps:8.0-noble-chiseled-extra</ContainerBaseImage>
+    <ContainerBaseImage>mcr.microsoft.com/dotnet/nightly/runtime-deps:9.0-noble-chiseled-extra</ContainerBaseImage>
     <ContainerFamily>noble-chiseled-extra</ContainerFamily>
   </PropertyGroup>
   <ItemGroup>