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

…nals build 20230919.1 (#92340)

Microsoft.SourceBuild.Intermediate.source-build-externals
 From Version 8.0.0-alpha.1.23468.1 -> To Version 8.0.0-alpha.1.23469.1

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

eng/Version.Details.xml

@@ -100,9 +100,9 @@
       <Sha>d825c6693d4e26f63aaa93c3c1d057faa098e347</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="8.0.0-alpha.1.23469.1">
       <Uri>/~https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>e9d6489787a5ea5400a31dfa34aa6ad6b590de9b</Sha>
+      <Sha>c42a7ce3b6fa02957e7b4ef995c5c2a9a23d294c</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
   </ProductDependencies>