Update to dotnet/runtime version 6.0.0-preview.2.21076.5

[ericstj]

Build ID 20210126.5

Fixes #42250 cc @jkotas

Before this:

sn -vf c:\src\dotnet\runtime\artifacts\bin\System.Runtime.CompilerServices.Unsafe\net6.0-Debug\System.Runtime.CompilerServices.Unsafe.dll

Microsoft (R) .NET Framework Strong Name Utility  Version 4.0.30319.0
Copyright (c) Microsoft Corporation.  All rights reserved.

c:\src\dotnet\runtime\artifacts\bin\System.Runtime.CompilerServices.Unsafe\net6.0-Debug\System.Runtime.CompilerServices.Unsafe.dll is a delay-signed or test-signed assembly

After:

sn -vf c:\src\dotnet\runtime\artifacts\bin\System.Runtime.CompilerServices.Unsafe\net6.0-Debug\System.Runtime.CompilerServices.Unsafe.dll

Microsoft (R) .NET Framework Strong Name Utility  Version 4.0.30319.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Failed to verify assembly -- Strong name validation failed.

Which is a good thing, SN doesn't know about public sign, but is observing that the assembly says it should be signed (rather than delay signed) and the signature is bogus, which is what public sign does.

[ghost]

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Issue Details

---

Build ID 20210126.5

Fixes #42250 cc @jkotas

Before this:

sn -vf c:\src\dotnet\runtime\artifacts\bin\System.Runtime.CompilerServices.Unsafe\net6.0-Debug\System.Runtime.CompilerServices.Unsafe.dll

Microsoft (R) .NET Framework Strong Name Utility  Version 4.0.30319.0
Copyright (c) Microsoft Corporation.  All rights reserved.

c:\src\dotnet\runtime\artifacts\bin\System.Runtime.CompilerServices.Unsafe\net6.0-Debug\System.Runtime.CompilerServices.Unsafe.dll is a delay-signed or test-signed assembly

After:

sn -vf c:\src\dotnet\runtime\artifacts\bin\System.Runtime.CompilerServices.Unsafe\net6.0-Debug\System.Runtime.CompilerServices.Unsafe.dll

Microsoft (R) .NET Framework Strong Name Utility  Version 4.0.30319.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Failed to verify assembly -- Strong name validation failed.

Which is a good thing, SN doesn't know about public sign.

Author:	ericstj
Assignees:	-
Labels:	area-Infrastructure-libraries
Milestone:	-

[ghost]

Hello @ViktorHofer!

Because this pull request has the auto-merge label, I will be glad to assist with helping to merge this pull request once all check-in policies pass.

p.s. you can customize the way I help with merging this pull request, such as holding this pull request until a specific person approves. Simply @mention me (@msftbot) and give me an instruction to get started! Learn more here.

[ericstj]

Failing tests are #47374