Binary incompatibility on Scala 3

[cptwunderlich]

I get an error on Scala 3, as a result of a binary incompatibility of the 2.13 cross-version artifacts of akka in the library.
I only tested this with newer versions of Akka (2.9.x), but I don't see any changes to the Serializer trait. Here is the error message:

[info] ApiSpec:
[info] showcase.server.api.ApiSpec  ABORTED  (854 milliseconds)
[info]   java.lang.NoSuchMethodError: 'void akka.serialization.Serializer.$init$(akka.serialization.Serializer)'
[info]   at io.altoo.akka.serialization.kryo.KryoSerializer.<init>(KryoSerializer.scala:81)
[info]   at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)
[info]   at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)
[info]   at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)
[info]   at akka.actor.ReflectiveDynamicAccess.createInstanceFor$$anonfun$1(ReflectiveDynamicAccess.scala:40)
[info]   at scala.util.Try$.apply(Try.scala:217)
[info]   at akka.actor.ReflectiveDynamicAccess.createInstanceFor(ReflectiveDynamicAccess.scala:44)
[info]   at akka.actor.ReflectiveDynamicAccess.createInstanceFor$$anonfun$2(ReflectiveDynamicAccess.scala:48)
[info]   at scala.util.Success.flatMap(Try.scala:266)
[info]   at akka.actor.ReflectiveDynamicAccess.createInstanceFor(ReflectiveDynamicAccess.scala:48)

This error is also mentioned in issue #291

The fix is quite simple: There are native Scala 3 artifacts for Akka 2.6.x on Sonatype maven.

I'll open a PR - I'd really appreciate a new release with this fix, as this is a hurdle in Scala 3 migration and it seems like other users might also be affected.