[logging] bump slf4j to 1.7.30
[logging] bump slf4j to 1.7.30

Problem

slf4j is not at the latest version

Solution

Update slf4j to the latest version

Result

slf4j is at the latest version

Differential Revision: https://phabricator.twitter.biz/D415019

twitter/finatra,twitter/finatra,twitter/finatra