build(deps): bump Microsoft.Reactive.Testing from 4.1.6 to 4.2.0 (#522)
build(deps): bump Microsoft.Reactive.Testing from 4.1.6 to 4.2.0 (#522)

Bumps [Microsoft.Reactive.Testing](https://github.com/dotnet/reactive) from 4.1.6 to 4.2.0.
- [Release notes](https://github.com/dotnet/reactive/releases)
- [Commits](https://github.com/dotnet/reactive/compare/rxnet-v4.1.6...rxnet-v4.2.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
bbqchickenrobot/Akavache,akavache/Akavache