this package seems to have new commits in its VCS but has
not yet updated debian/changelog. You should consider updating
the Debian changelog and uploading this new version into the archive.
Here are the relevant commit logs:
Author: Matthias Klose <firstname.lastname@example.org>
Date: Wed Jul 17 16:49:37 2019 +0200
* OpenJDK 12.0.2+9 release.
* Bump standards version.