sle15-unknown: switch to sle15sp4
Since this represents an unknown/unreleased/future SLE 15 version, then base it on the current latest SLE 15.x release, i.e. 15 SP4.
Signed-off-by: Pino Toscano ptoscano@redhat.com
Since this represents an unknown/unreleased/future SLE 15 version, then base it on the current latest SLE 15.x release, i.e. 15 SP4.
Signed-off-by: Pino Toscano ptoscano@redhat.com