[main] Update dependencies from dotnet/source-build-reference-packages (#11350)

* Update dependencies from https://github.com/dotnet/source-build-reference-packages build 20250131.6

Microsoft.SourceBuild.Intermediate.source-build-reference-packages
 From Version 9.0.0-alpha.1.25066.1 -> To Version 9.0.0-alpha.1.25081.6

---------

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -2,9 +2,9 @@
 <Dependencies>
   <ProductDependencies>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25066.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25081.6">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>93a3395781d30f69201367371c28cfc5005c0264</Sha>
+      <Sha>1cec3b4a8fb07138136a1ca1e04763bfcf7841db</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. -->