debian: switch upgrades/derives-from of testing to 10
The latest stable is Debian 10, so make sure that testing upgrades from it.
Signed-off-by: Pino Toscano ptoscano@redhat.com
The latest stable is Debian 10, so make sure that testing upgrades from it.
Signed-off-by: Pino Toscano ptoscano@redhat.com