Moving Dependencies.props back to ToolsVersion=4.0 to satisfy RepoUtil

build/Targets/Dependencies.props

 <?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <!--Generated file, do not directly edit.  Run "RepoUtil change" to regenerate-->
   <PropertyGroup>
     <GitLinkVersion>2.3.0</GitLinkVersion>