[main] Update dependencies from dotnet/source-build-externals

[dotnet-maestro[bot]]

This pull request updates the following dependencies

From https://github.com/dotnet/source-build-externals

• Subscription: 86950fd0-829d-4c2e-7e88-08db4ca58899

• Build: 20240620.1

• Date Produced: June 20, 2024 1:05:56 PM UTC

• Commit: 9a2785b8409e4ee8db848cc2fbfa19b3316a3baa

• Branch: refs/heads/main

• Updates:

  • Microsoft.SourceBuild.Intermediate.source-build-externals: from 9.0.0-alpha.1.24303.2 to 9.0.0-alpha.1.24320.1