Update dependencies from https://github.com/dotnet/source-build-externals build 20241021.1

Microsoft.SourceBuild.Intermediate.source-build-externals
 From Version 10.0.0-alpha.1.24516.1 -> To Version 10.0.0-alpha.1.24521.1

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -372,9 +372,9 @@
       <Sha>3648d836eb2e8ef6aadd3b8b06f90ed130e787c9</Sha>
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="10.0.0-alpha.1.24516.1">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-externals" Version="10.0.0-alpha.1.24521.1">
       <Uri>https://github.com/dotnet/source-build-externals</Uri>
-      <Sha>d22c9e818d40d0b36874f8db31550b1ea7f66c72</Sha>
+      <Sha>152bd2a5bc0d0f19033b42f48a026339d50101ad</Sha>
       <SourceBuild RepoName="source-build-externals" ManagedOnly="true" />
     </Dependency>
   </ProductDependencies>

eng/Versions.props

@@ -170,7 +170,7 @@
     <MicrosoftDotNetRemoteExecutorVersion>10.0.0-beta.24515.3</MicrosoftDotNetRemoteExecutorVersion>
     <MicrosoftSourceBuildIntermediatearcadeVersion>10.0.0-beta.24515.3</MicrosoftSourceBuildIntermediatearcadeVersion>
     <!-- Packages from dotnet/source-build-externals -->
-    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>10.0.0-alpha.1.24516.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
+    <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>10.0.0-alpha.1.24521.1</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
     <!-- Packages from dotnet/source-build-reference-packages -->
     <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>10.0.0-alpha.1.24521.1</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->