New features and behavior changes, can also contain breaking changes due to bump of major version in semver.
Breaking changes:

• Java 17 is the new minimum
• Scala 2.12 support dropped
• A lot of deprecated code removed
• A lot of pekko.util classes for Scala version compatibility have been removed
• Big change for all Java DSL users due to the removal of pekko.japi.Function (and related classes) to use pekko.japi.function.Function instead (lambdas should recompile ok but if declare variables or functions explicitly, then you may need to change your imports)