build with pekko 2.0.0-M1

[pjfanning]

• there are breaking integration tests for k8s
• these tests use Docker containers and the JVM that runs in them fail because Agrona needs --add-opens=java.base/jdk.internal.misc=ALL-UNNAMED but so far, I've been unable to get the sbt setup in place so that the docker containers call java with the add-opens.

[mdedetrich]

Failing again for same reasons as pekko-http, i.e. the argona API using unsafe

[pjfanning]

Failing again for same reasons as pekko-http, i.e. the argona API using unsafe

@mdedetrich I've added the add-opens and now the issue is just that pekko-http 1.3.0 is not compatible with pekko 2.0.0-M1. I'm not guaranteeing that the add-opens is correct as is but the problem in integration tests is now down to a missing class in pekko 1 that pekko-http 1 needs.
My plan is to create an RC for pekko-http in a few days. it will be easier to continue the work in pekko-management.