0.3.0
deps: update all sorts of stuff (#121) This pr goes through and makes the various updates: - Bumps mill to the latest 0.10.5 - Bumps to the latest Scala versions for 2 and latest 3.1.x version - Drops 0.x support for ScalaJS - Move Scala native to 0.4.x - Adds in dependabot - Starts to cross test on 8 and 17 - Updates checkout and java actions