more work on fixing dependency-graph CI job

[pjfanning]

• ran ok in https://github.com/apache/pekko-persistence-dynamodb/actions/runs/12570185060 (when I temporarily enabled the job for PRs)
• the job runs ok with ubuntu-22 but not latest (it works with ubuntu-latest in apache/pekko repo though)

[samueleresca]

In ubuntu-latest (ubuntu-24.04) is running Java 17 as the default option.. I think Java 17 do not support this flag anymore: -XX:+CMSClassUnloadingEnabled. Therefore, it breaks. I'm not sure if -XX:+CMSClassUnloadingEnabled can be removed

[samueleresca]

The reason why was working on the original PR is because it was running on Ubuntu 22.04. I think they are switching ubuntu-latest to Ubuntu 24.04 as we speak:

This change will be rolled out over a period of several weeks beginning December 5th and will complete on January 17th, 2025.

We might experience more pipeline flakiness in the other Pekko repos if we have JVM configs that have been deprecated between versions

[pjfanning]

CMSClassUnloadingEnabled.

I don't know where this comes from. scalacenter/sbt-dependency-submission does not seem to set it. Maybe sbt does?

[samueleresca]

CMSClassUnloadingEnabled.

I don't know where this comes from. scalacenter/sbt-dependency-submission does not seem to set it. Maybe sbt does?

That option is coming from the .jvmopts file in this repo. I think scalacenter/sbt-dependency-submission picks up that