Update dependencies from https://github.com/dotnet/source-build-exter…

…nals build 20240909.2 (#107607)

Microsoft.SourceBuild.Intermediate.source-build-externals
 From Version 9.0.0-alpha.1.24452.1 -> To Version 9.0.0-alpha.1.24459.2

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

eng/Version.Details.xml

@@ -81,9 +81,9 @@
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.24452.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.24459.2">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>eab3dc5eabdf8bcd9bbdf917741aab335c74373d</Sha>
+      <Sha>71b0a48963717f08dc2d3d26527a2587316170fc</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
   </ProductDependencies>