Update dependencies from https://github.com/dotnet/source-build-reference-packages build 20250404.2 (#15045)

Microsoft.SourceBuild.Intermediate.source-build-reference-packages
 From Version 10.0.617601 -> To Version 10.0.620402

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="10.0.617601">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="10.0.620402">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>1556b6c639edcaee959013681afcf2e66b118537</Sha>
+      <Sha>14f833124983b36ac4083338d0cad6caefce2489</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. -->