OAK-9641: Update Logback version to 1.2.8
OAK-9641: Update Logback version to 1.2.8

apache/jackrabbit-oak,apache/jackrabbit-oak,apache/jackrabbit-oak,amit-jain/jackrabbit-oak,amit-jain/jackrabbit-oak,mreutegg/jackrabbit-oak,apache/jackrabbit-oak,mreutegg/jackrabbit-oak,amit-jain/jackrabbit-oak,mreutegg/jackrabbit-oak,mreutegg/jackrabbit-oak,mreutegg/jackrabbit-oak,amit-jain/jackrabbit-oak,apache/jackrabbit-oak,amit-jain/jackrabbit-oak