Bump reactive streams dependency version from 1.0.2 to 1.0.3

Currently used reactive streams dependency has pretty old version 1.0.2 which dates back to 2017. Newer version of this dependency is avaliable (version 1.0.3) and is use by newest version of various reactive streams libraries like akka-streams or fs2-reactive-streams. So, adding this driver as a dependency creates restriction to use very old version of libraries. Please update version of this dependency up to new.