update corefx to version toolset is expecting

Author: crummel

dependencies.props

@@ -30,7 +30,7 @@
   <!-- Build stabilization properties as passed in by ProdCon. -->
   <PropertyGroup>
     <UseStableVersions Condition="'$(UseStableVersions)' == ''">false</UseStableVersions>
-    <VersionStamp Condition="'$(VersionStamp)' == ''">preview</VersionStamp>
+    <VersionStamp Condition="'$(VersionStamp)' == ''">preview1</VersionStamp>
   </PropertyGroup>
 
   <ItemGroup>

repos/corefx.proj

@@ -23,7 +23,7 @@
 
     <PackagesOutput>$(ProjectDirectory)/bin/packages/$(Configuration)</PackagesOutput>
     <CleanCommand>$(ProjectDirectory)/clean$(ShellExtension)</CleanCommand>
-    <OfficialBuildId>20181014-02</OfficialBuildId>
+    <OfficialBuildId>20181023-03</OfficialBuildId>
   </PropertyGroup>
 
   <ItemGroup>