v0.9.0

Release summary

Cross publishing monix connectors for scala3 in #974

List of changes

• Adds Scala3 to all project scala cross versions, but mongodb.
• Mongodb will not support scala3 until it's macros from scala-mongodb-driver and bson libraries are ported and released for scala3.
• Mockito library is used on some monix connectors for unit testing, so we have moved those test to a separate package for scala-2.x.x in order to support cross testing.
• Pureconfig updates which drops macros usage from import pureconfig.generic.auto._ by defining ConfigReaders from pureconfig core module.
• Adds cross testing to github-ci matrix.

Full Changelog: v0.6.4...v0.9.0