SLING-3243 Update the Slf4j API bundle to 1.7.5
SLING-3243 Update the Slf4j API bundle to 1.7.5

Updating the version to 1.7.5 for following deps
* slf4j-api
* jcl-over-slf4j
* log4j-over-slf4j

git-svn-id: 6eed74fe9a15c8da84b9a8d7f2960c0406113ece@1541535 13f79535-47bb-0310-9956-ffa450edef68

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