Update dependencies from https://github.com/dotnet/xdt build 20231218.2 (#52904)

Microsoft.Web.Xdt
 From Version 9.0.0-preview.23615.1 -> To Version 9.0.0-preview.23618.2

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

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -328,9 +328,9 @@
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>c282395b63c1757d4f4c1dc2e236680cfe2e7f96</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.Web.Xdt" Version="9.0.0-preview.23615.1">
+    <Dependency Name="Microsoft.Web.Xdt" Version="9.0.0-preview.23618.2">
       <Uri>https://github.com/dotnet/xdt</Uri>
-      <Sha>6d4a3674dd97b2be18b3ded0d52ea18d04fde4cc</Sha>
+      <Sha>0c3c5878cd2f204a4335755f753eda78ecab536b</Sha>
       <SourceBuild RepoName="xdt" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="Microsoft.SourceBuild.Intermediate.source-build-reference-packages" Version="9.0.0-alpha.1.23618.2">

eng/Versions.props

@@ -172,7 +172,7 @@
     <!-- Packages from dotnet/winforms -->
     <SystemDrawingCommonVersion>9.0.0-alpha.1.23618.1</SystemDrawingCommonVersion>
     <!-- Packages from dotnet/xdt -->
-    <MicrosoftWebXdtVersion>9.0.0-preview.23615.1</MicrosoftWebXdtVersion>
+    <MicrosoftWebXdtVersion>9.0.0-preview.23618.2</MicrosoftWebXdtVersion>
   </PropertyGroup>
   <!--