Update dependencies from https://github.com/dotnet/source-build-reference-packages build 20250409.1 (#15059)

Microsoft.SourceBuild.Intermediate.source-build-reference-packages
 From Version 10.0.621801 -> To Version 9.0.0-alpha.1.25209.1

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -22,9 +22,9 @@
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="10.0.621801">
+    <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>2228b4511efb4aca61317883c615208cd13b66a7</Sha>
+      <Sha>7dbf5deea5bdccf513df73cba179c4c0ad106010</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <!-- Necessary for source-build. This allows the live version of the package to be used by source-build. -->