Update Aspire version to 13.3.0-preview.1.26229.4

[github-actions]

This PR updates the Aspire version to the latest nightly build 13.3.0-preview.1.26229.4 from the dotnet9 feed.

Changes Made

1. Directory.Build.props

   • Updated AspireVersion to 13.3.0-preview.1.26229.4
   • Cleared AspirePreviewSuffix (now empty string) to avoid confusion with official preview versions when using nightly builds

2. All AppHost Project Files (52 files)

   • Updated Aspire.AppHost.Sdk version from 13.3.0 to 13.3.0-preview.1.26229.4
   • Files span across examples/, tests-app-hosts/, and tests/ directories

3. nuget.config

   • Enabled the dotnet9 package source mapping for Aspire.* packages
   • This allows NuGet to resolve Aspire packages from the dotnet9 nightly feed

Package Source

All Aspire packages are sourced from:

https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json

Verification

The version was verified to exist using:

dotnet package search Aspire.AppHost.Sdk --prerelease --exact-match --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• dnceng.pkgs.visualstudio.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "dnceng.pkgs.visualstudio.com"

See Network Configuration for more information.

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