[release/3.1.4xx] Update dependencies from nuget/nuget.client

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/NuGet/NuGet.Client

• Subscription: 7c87b7fc-1d68-435f-7062-08d7e6f19e0b
• Build: 5.7.0.6592
• Date Produced: 4/25/2020 3:36 PM
• Commit: 4dbf16e68eabf507b9f156c801b1b7c3b0586e43
• Branch: dev
• Updates:
  • NuGet.Build.Tasks: from 5.6.0-preview.3.6558 to 5.7.0-preview.1.6592

[dotnet-maestro]

Auto-Merge Status

This pull request has not been merged because Maestro++ is waiting on the following merge policies.

• ❌ Standard Merge Policies Unsuccessful 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 Windows_NT Build_Release_x64), .NET Core CLI CI (Build Linux Build_OpenSUSE_42_3_Debug_x64), .NET Core CLI CI (Build Windows_NT Build_DropSuffix_Release_x64), .NET Core CLI CI (Build Linux Build_Fedora_27_Debug_x64), .NET Core CLI CI (Build Windows_NT Build_ES_Debug_x64), .NET Core CLI CI (Build Linux Build_Ubuntu_18_04_Debug_x64), .NET Core CLI CI (Build Windows_NT Build_Debug_x86), .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 Darwin Build_Release)
• ✔️ Standard Merge Policies Succeeded - No reviews have requested changes.
• ✔️ Standard Merge Policies Succeeded - No version downgrade detected.