Bump rxjava from 3.0.5 to 3.0.6
Bump rxjava from 3.0.5 to 3.0.6

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 3.0.5 to 3.0.6.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](https://github.com/ReactiveX/RxJava/compare/v3.0.5...v3.0.6)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
tonivade/resp-server