Bump Verify.Xunit from 20.4.0 to 26.0.0 in /Rx.NET/Source

[dependabot[bot]]

Bumps Verify.Xunit from 20.4.0 to 26.0.0.

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

• 07b1335 Update Directory.Build.props
• 0fc72c2 Breaking: Respect NUnit class level parameters and drop support for custom Te...
• 5e5f716 Update bug_report.md
• 3029cd8 Update bug_report.md
• 39fb3f9 docs
• 33b491c Docs changes
• 82547d7 Update readme.source.md
• 49a80bc docs
• 491eaeb docs
• c0367cb docs
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #2157.