Update dependencies from https://github.com/dotnet/source-build-externals build 20230918.1 (#50784)

[release/8.0] Update dependencies from dotnet/source-build-externals

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -189,9 +189,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>9cdbc87dadbf358206f20f17fed005cdcb253452</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23462.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="8.0.0-alpha.1.23468.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>5a3e6274a3749c3e6f8b2b3a01e6b42960687e86</Sha>
+      <Sha>e9d6489787a5ea5400a31dfa34aa6ad6b590de9b</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.symreader" Version="2.0.0-beta-23228-03">

eng/Versions.props

@@ -163,7 +163,7 @@
     <MicrosoftDotNetBuildTasksTemplatingVersion>8.0.0-beta.23451.1</MicrosoftDotNetBuildTasksTemplatingVersion>
     <MicrosoftDotNetRemoteExecutorVersion>8.0.0-beta.23451.1</MicrosoftDotNetRemoteExecutorVersion>
     <!-- Packages from dotnet/source-build-externals -->
-    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23462.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
+    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>8.0.0-alpha.1.23468.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
     <!-- Packages from dotnet/source-build-reference-packages -->
     <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>8.0.0-alpha.1.23463.1</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->