Bump Verify.Xunit from 6.19.0 to 6.21.0 in /src
Bump Verify.Xunit from 6.19.0 to 6.21.0 in /src

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 6.19.0 to 6.21.0.
- [Release notes](https://github.com/VerifyTests/Verify/releases)
- [Commits](https://github.com/VerifyTests/Verify/compare/6.19.0...6.21.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hmemcpy/NServiceBus.Wire