Changing the Slf4j API bundle version in parent pom would be tricky. So to allow bundle to use new API and still be deployable on Sling system which package older version of Slf4j API bundle I have provided some steps at [1]. If the steps looks acceptable I would add them to Sling site
Chetan Mehrotra [1] https://issues.apache.org/jira/browse/SLING-3243?focusedCommentId=13825128
