Bump Microsoft.NET.Test.Sdk from 16.7.1 to 16.8.0

Created by: dependabot-preview[bot]

Bumps Microsoft.NET.Test.Sdk from 16.7.1 to 16.8.0.

Release notes

Sourced from Microsoft.NET.Test.Sdk's releases.

v16.8.0

See the release notes here.

v16.8.0-preview-20200921-01

See the release notes here.

v16.8.0-preview-20200812-03

See the release notes here.

v16.8.0-preview-20200806-02

See the release notes here.

Commits

• d6875ce Cherry-picked signing fixes from master (#2619)
• b195e25 Signing instructions for Newtonsoft.Json.dll added (#2601) (#2603)
• 0b1e2e5 Fix the initial assets location of VSTest assets (#2589)
• 2e615ad Generate release notes in pipeline
• 2418d9e Forward merge fixes from master to rc2 (#2581)
• 70a599d Fix blame parameter, warning, and add all testhosts to be ngend (#2579)
• 0c0fafa Merge branch 'master' of https://github.com/microsoft/vstest into rel/16.8
• 95cb80f Blame upload on crash even if hang dump started (#2553)
• deb218e Fix errors reported by StyleCop Analyzers (#2555)
• ddda590 Improve blame (#2552)
• Additional commits viewable in compare view

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