kiji-poms: POM-44. Upgrade dependency to slf4j-api 1.7.5 (provided)

issue: https://jira.kiji.org/browse/POM-44
review: https://review.kiji.org/r/2050
commit: https://github.com/kijiproject/kiji-poms/commit/7dbb17dd24276ad4d847db3564d27d37b58fe413