[main] Update dependencies from dotnet/source-build-externals (#92341)

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>
Co-authored-by: Larry Ewing <lewing@microsoft.com>

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -100,9 +100,9 @@
       <Sha>fc01829cbf76b7bbf48a39161562468715a0a3b4</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23468.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.23471.3">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>e9d6489787a5ea5400a31dfa34aa6ad6b590de9b</Sha>
+      <Sha>fb896b0f1c716ae84e4e4787d0a02a0002988508</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
   </ProductDependencies>