[LTS only] Fix synchronization of -java-output-versions with JVM backend

[WojciechMazur]

Fixes a bug in Scala settings after #22111 which edited wrong ScalaSettings.scala file - the backport to LTS updated max JDK version in the pos/compiler-with-cc tests directory instead of the one in the main sources.

The fix would follow a Scala 3.3.5-RC3 release on Monday

[He-Pin]

@WojciechMazur is Pekko included in Scala 3.6.x's community build? Seems it can't be compiled for now, and I think the community build should add the latest Java version to the matrix too.

[WojciechMazur]

Pekko is covered by OpenCB, but was failing for some time now, due to cyclic reference error - I tried at least twice to minimize this issue, but failed each time - here's link to example failing build logs
OpenCB is currently only using JDK LTS releases: 8, 11, 17, 21, we might consider adding support for additional one (latest) in the future, but we'd prefer using only LTS releases due to infrastructure limits.

Regarding managed community build (executed in each PR in scala/scala3 repo) apache/pekko is not covered, however some older revision of akka/akka is tested. It's also limited to usage of JDK 8.