Update dependencies from https://github.com/dotnet/source-build-reference-packages build 20231218.2 (#52903)

Microsoft.SourceBuild.Intermediate.source-build-reference-packages
 From Version 9.0.0-alpha.1.23615.3 -> To Version 9.0.0-alpha.1.23618.2

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -333,9 +333,9 @@
       <Sha>6d4a3674dd97b2be18b3ded0d52ea18d04fde4cc</Sha>
       <SourceBuild RepoName="xdt" ManagedOnly="true" />
     </Dependency>
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.23615.3">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.23618.2">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>ad274914920e8e51c5269d215a641e592af8182c</Sha>
+      <Sha>c49c1f4e461b4b57d6d3449671942786bf8fcbb6</Sha>
       <SourceBuild RepoName="source-build-reference-packages" ManagedOnly="true" />
     </Dependency>
     <!-- Not updated automatically -->

eng/Versions.props

@@ -166,7 +166,7 @@
     <!-- Packages from dotnet/source-build-externals -->
     <MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>9.0.0-alpha.1.23611.2</MicrosoftSourceBuildIntermediatesourcebuildexternalsVersion>
     <!-- Packages from dotnet/source-build-reference-packages -->
-    <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>9.0.0-alpha.1.23615.3</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
+    <MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>9.0.0-alpha.1.23618.2</MicrosoftSourceBuildIntermediatesourcebuildreferencepackagesVersion>
     <!-- Packages from dotnet/symreader -->
     <MicrosoftSourceBuildIntermediatesymreaderVersion>2.1.0-beta.23615.1</MicrosoftSourceBuildIntermediatesymreaderVersion>
     <!-- Packages from dotnet/winforms -->