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

…nals build 20231211.2 (#95908)

Microsoft.SourceBuild.Intermediate.source-build-externals
 From Version 9.0.0-alpha.1.23608.1 -> To Version 9.0.0-alpha.1.23611.2

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

eng/Version.Details.xml

@@ -104,9 +104,9 @@
       <Sha>9e09ace1897546ac85dab114a6e1a5b6f773db7a</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.23608.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.23611.2">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>2e66b74da89aabcce9628cfc4b7a2925c54f6841</Sha>
+      <Sha>bc555088c6b4862ad0b93fbc245ef0628e661256</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
   </ProductDependencies>