Update dependencies from https://github.com/dotnet/source-build-reference-packages build 20250409.1

Microsoft.SourceBuild.Intermediate.source-build-reference-packages
 From Version 9.0.0-alpha.1.25204.3 -> To Version 9.0.0-alpha.1.25209.1

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -451,9 +451,9 @@
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25204.3">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25209.1">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>643689c88b1d5a0f1561383972c4189a0c673abe</Sha>
+      <Sha>7dbf5deea5bdccf513df73cba179c4c0ad106010</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.Deployment.DotNet.Releases" Version="2.0.0-rtm.1.25059.4">