4.x: Java target version clarification #8089

We started out with Java 25 LTS level of support.

We bumped up to 26 once it released. However, I didn't see any enticing feature to be included on the API surface.

We might fall back to 25 at the end. No code changes required.

Depending on the progress and contents, we could also upgrade to 27 in September, but what it might feature is still to be discovered.