[main] Update dependencies from dotnet/source-build-externals (#4664)

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -14,9 +14,9 @@
       <Sha>5ce78f66d89ea529e459abddb129ab36cb5bd936</Sha>
       <SourceBuild RepoName="diagnostics" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23410.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23418.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>2403b57088fa5f428cf6e071cf57b4f3e547c5e4</Sha>
+      <Sha>8fc77fa8f591051da1120ebb76c3795b7b584495</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="8.0.0-alpha.1.23408.2">