A while back we removed SLF4J from GraphQL Java. https://github.com/graphql-java/graphql-java/pull/3403/files Apart from the difficult PII/UGC problems, it was also causing unusual version clashes for users.

I spotted we still had SLF4J mentioned in this repo, but we don't seem to use it at all. Let's remove it to keep the set of dependencies to a minimum