Bump xunit.core from 2.3.1 to 2.4.1

[dependabot-preview[bot]]

Bumps xunit.core from 2.3.1 to 2.4.1.

Commits

• c54cc52 Fix generic oversight v2 (#1825)
• 5959d74 #1816 Error message doesn't respect -nocolor option (#1824)
• 975ff0c update msbuild extras (#1823)
• e97b967 Pick up latest build-tools
• be452a2 Fixes #1801: Remove the gratuitous netstandard2.0 libraries
• eaeff26 Fix all the broken build things
• ad20ed1 Drop back to .NET SDK 2.1.302 for AppVeyor
• ffee51a Update to xunit.abstractions 2.0.3
• 2ec6169 Add v2 branch to appveyor.yml
• aa79468 Update NUnitXml.xslt to emit properties element before reason/failure (#1797)
• Additional commits viewable in compare view

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