Merge pull request dotnet#29722 from JoeRobich/update-sdk-2.1.401

Upgrade to .NET Core SDK version 2.1.401

build/Targets/Tools.props

@@ -20,7 +20,7 @@
         - Update links and version numbers in docs/contributing/Building%2C%20Debugging%2C%20and%20Testing%20on%20Windows.md
         - Email the team to ask them to upgrade to the new SDK
     -->
-    <dotnetSdkVersion>2.1.300-rtm-008866</dotnetSdkVersion>
+    <dotnetSdkVersion>2.1.401</dotnetSdkVersion>
     <monoVersion>5.8.0.88</monoVersion>
     <vsMinimumVersion>15.7</vsMinimumVersion>
   </PropertyGroup>

docs/contributing/Building, Debugging, and Testing on Windows.md

@@ -23,7 +23,7 @@ If a stack trace is displayed on .NET Framework older than 4.7.2 (e.g. by xUnit
 1. [Visual Studio 2017 Version 15.7](https://www.visualstudio.com/vs/preview/)
     - Ensure C#, VB, MSBuild, .NET Core and Visual Studio Extensibility are included in the selected work loads
     - Ensure Visual Studio is on Version "15.7" or greater
-1. [.NET Core SDK 2.1.300](https://www.microsoft.com/net/download/core) (the current previews are: [Windows x64 installer](https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300-rtm-008866/dotnet-sdk-2.1.300-rtm-008866-win-x64.exe), [Windows x86 installer](https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300-rtm-008866/dotnet-sdk-2.1.300-rtm-008866-win-x86.exe))
+1. [.NET Core SDK 2.1.401](https://www.microsoft.com/net/download/core) (the installers are: [Windows x64 installer](https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.401/dotnet-sdk-2.1.401-win-x64.exe), [Windows x86 installer](https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.401/dotnet-sdk-2.1.401-win-x86.exe))
 1. [PowerShell 3.0 or newer](https://docs.microsoft.com/en-us/powershell/scripting/setup/installing-windows-powershell). If you are on Windows 10, you are fine; you'll only need to upgrade if you're on Windows 7. The download link is under the "upgrading existing Windows PowerShell" heading.
 1. Run Restore.cmd
 1. Open Roslyn.sln

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "2.1.300-rtm-008866"
+    "version": "2.1.401"
   }
 }