Bump Verify.Xunit from 20.4.0 to 21.1.3 in /Rx.NET/Source

[dependabot[bot]]

Bumps Verify.Xunit from 20.4.0 to 21.1.3.

Release notes

Sourced from Verify.Xunit's releases.

21.0.0

• Drop unsupported frameworks

20.8.1

As part of this release we had 6 commits which resulted in 1 issue being closed.

Bug

• [#969](VerifyTests/Verify#969) System.PlatformNotSupportedException : System.Management currently is only supported for Windows desktop applications.

20.8.0

As part of this release we had 9 commits which resulted in 1 issue being closed.

Feature

• [#967](VerifyTests/Verify#967) update EmptyFiles and DiffEngine

20.6.0

As part of this release we had 16 commits which resulted in 1 issue being closed.

Feature

• [#945](VerifyTests/Verify#945) expose GetNameForParameter

20.5.0

As part of this release we had 1 issue closed.

Improvement

• [#934](VerifyTests/Verify#934) update to DiffEngine v 12

Commits

• c286aad Update Directory.Build.props
• 72a754a Handle Stream throwing for Length (#995)
• 92838ed docs
• 246fe00 Update Directory.Build.props
• 9a29f1d Merge branch 'main' of https://github.com/VerifyTests/Verify
• de55a82 Update StreamTests.UnboundedStream.verified.txt
• ea3ed57 Update ExceptionParsingTests.cs
• a9b4ffd Update global.json
• ed065b4 Bump ProjectDefaults from 1.0.96 to 1.0.97 in /src (#994)
• 371ea36 cleanup
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #2001.