Update dependencies from https://github.com/dotnet/source-build-exter…

…nals build 20240603.2 (#103032)

Microsoft.SourceBuild.Intermediate.source-build-externals
 From Version 9.0.0-alpha.1.24278.2 -> To Version 9.0.0-alpha.1.24303.2

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

eng/Version.Details.xml

@@ -85,9 +85,9 @@
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.24278.2">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="9.0.0-alpha.1.24303.2">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>f1b44a365df0b8dbc38403ee8696adc25fbdd76a</Sha>
+      <Sha>7db00527ef8fbbe61f67e9295beebddf187efff8</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
   </ProductDependencies>