Update dependencies from https://github.com/dotnet/source-build-reference-packages build 20251006.2 (#1436)

On relative base path root
Microsoft.SourceBuild.Intermediate.source-build-reference-packages From Version 9.0.0-alpha.1.25475.3 -> To Version 9.0.0-alpha.1.25506.2

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -242,9 +242,9 @@
       <SourceBuild RepoName="arcade" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25475.3">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.25506.2">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>1700b6ddf7c81e103ff12f5965b078b64c84252a</Sha>
+      <Sha>5511a69718e9d581386105705152592cee268e37</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
   </ToolsetDependencies>