[release/3.1.2xx] Update dependencies from dotnet/sdk

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/dotnet/sdk

• Subscription: bdd984ca-7112-4d1b-d452-08d76e1d3434
• Build: 20200226.2
• Date Produced: 2/27/2020 1:27 AM
• Commit: 1a75f83011dccb47a8b9689704b961a0bf09ca14
• Branch: refs/heads/release/3.1.2xx
• Updates:
  • Microsoft.NET.Sdk -> 3.1.200-preview.20126.2

[dotnet-maestro]

Auto-Merge Status

This pull request has been merged because the following merge policies have succeeded.

• ✔️ Standard Merge Policies Succeeded - Successful checks: .NET Core CLI CI, .NET Core CLI CI (Build Linux Build_LinuxPortable_NoSuffix_Release_x64), .NET Core CLI CI (Build Linux Build_LinuxPortable_Release_x64), .NET Core CLI CI (Build Linux Build_Linux_musl_Debug_x64), .NET Core CLI CI (Build Linux Build_Rhel_6_Debug_x64), .NET Core CLI CI (Build Linux Build_Rhel_7_2_Release_x64), .NET Core CLI CI (Build Linux Build_Debian_jessie_Debug_x64), .NET Core CLI CI (Build Linux Build_CentOS_7_1_Debug_x64), .NET Core CLI CI (Build Linux Build_OpenSUSE_42_3_Debug_x64), .NET Core CLI CI (Build Darwin Build_Release), .NET Core CLI CI (Build Linux Build_Fedora_27_Debug_x64), .NET Core CLI CI (Build Linux Build_Ubuntu_18_04_Debug_x64), .NET Core CLI CI (Build Linux Build_Ubuntu_16_04_Debug_x64), .NET Core CLI CI (Build Linux Build_Ubuntu_14_04_Release_x64), .NET Core CLI CI (Build Windows_NT Build_Release_x64), .NET Core CLI CI (Build Windows_NT Build_DropSuffix_Release_x64), .NET Core CLI CI (Build Windows_NT Build_ES_Debug_x64), .NET Core CLI CI (Build Windows_NT Build_Debug_x86)
• ✔️ Standard Merge Policies Succeeded - No reviews have requested changes.