Investigate why the system tests aren't run with Java 25

[mhalbritter]

    strategy:
      matrix:
        java:
          - version: 17
            toolchain: true
          - version: 21
            toolchain: true

See if they run with Java 25, and if not, try to fix that.

[hojooo]

Hello! I'm interested in working on this issue. Would it be okay if I take this on?

[mhalbritter]

Hey @hojooo, thanks for the offer. These kinds of infrastructure issues are better solved by us, because we can test them on the CI infrastructure.

[hojooo]

Okay, I understand @mhalbritter. Thanks for the reply!