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Deps file for MSBuild shouldn't downgrade common task dependencies.

See original GitHub issue

Steps to reproduce

Produce a task with a dependency on a new version of roslyn.

Expected behavior

Task works on latest SDK

Actual behavior

Task fails to load with ref-def mismatch for roslyn DLLs since old version (2.1.0) is listed in MSBuild’s deps file and carried in the MSBuild bin folder.

Environment data

dotnet --info output:

.NET Core SDK (reflecting any global.json):
 Version:   3.0.100-preview6-011681
 Commit:    2f5626d019

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.17763
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   D:\dotnet\corefx\.dotnet\sdk\3.0.100-preview6-011681\

Host (useful for support):
  Version: 3.0.0-preview6-27629-07
  Commit:  a3967b6096

.NET Core SDKs installed:
  2.2.103 [D:\dotnet\corefx\.dotnet\sdk]
  3.0.100-preview6-011681 [D:\dotnet\corefx\.dotnet\sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.2.1 [D:\dotnet\corefx\.dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.2.1 [D:\dotnet\corefx\.dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.0.0-preview6-19230-05 [D:\dotnet\corefx\.dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.2.1 [D:\dotnet\corefx\.dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.0.0-preview6-27629-07 [D:\dotnet\corefx\.dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.0.0-preview6-27629-07 [D:\dotnet\corefx\.dotnet\shared\Microsoft.WindowsDesktop.App]