chore: prepare AkkaVersionInDocs for 2.10 (#575)

Author: patriknw

docs/src/main/paradox/getting-started.md

@@ -22,7 +22,7 @@ This plugin depends on Akka $akka.version$ or later, and note that it is importa
 dependencies are in the same version, so it is recommended to depend on them explicitly to avoid problems 
 with transient dependencies causing an unlucky mix of versions.
 
-The plugin is published for Scala 2.13 and 2.12.
+The plugin is published for Scala 2.13 and 3.3
 
 ## Enabling
 

project/Dependencies.scala

@@ -10,7 +10,7 @@ object Dependencies {
   val Scala2Versions = Seq(Scala213)
   val ScalaVersions = Dependencies.Scala2Versions :+ Dependencies.Scala3
   val AkkaVersion = System.getProperty("override.akka.version", "2.9.3")
-  val AkkaVersionInDocs = AkkaVersion.take(3)
+  val AkkaVersionInDocs = VersionNumber(AkkaVersion).numbers match { case Seq(major, minor, _*) => s"$major.$minor" }
   val AkkaPersistenceJdbcVersion = "5.4.0" // only in migration tool tests
   val AkkaProjectionVersionInDocs = "current"
   val H2Version = "2.2.224"