Bump Verify.Xunit from 1.33.0 to 1.34.2 in /Rx.NET/Source
Bumps [Verify.Xunit](https://github.com/SimonCropp/Verify) from 1.33.0 to 1.34.2.
- [Release notes](https://github.com/SimonCropp/Verify/releases)
- [Commits](https://github.com/SimonCropp/Verify/compare/1.33.0...1.34.2)
Signed-off-by: dependabot-preview[bot] <[email protected]>