Update branding to 3.1.2 (#27998)

eng/Versions.props doesn't seem to be the source of truth for branding

Author: mmitche

dir.common.props

@@ -65,7 +65,7 @@
 
   <PropertyGroup>
     <!-- Central place to set the versions of all nuget packages produced in the repo -->
-    <PackageVersion Condition="'$(PackageVersion)' == ''">3.1.1</PackageVersion>
+    <PackageVersion Condition="'$(PackageVersion)' == ''">3.1.2</PackageVersion>
     <PreReleaseLabel>servicing</PreReleaseLabel>
   </PropertyGroup>