Updating slf4j version too

Author: effrafax

pom.xml

@@ -67,7 +67,7 @@
     <redback.registry.version>2.4</redback.registry.version>
     <redback.spring-utils.version>2.1</redback.spring-utils.version>
     <redback.taskqueue.version>2.1</redback.taskqueue.version>
-    <slf4j.version>1.7.25</slf4j.version>
+    <slf4j.version>1.7.32</slf4j.version>
     <log4j.version>2.17.0</log4j.version>
 
     <spring.version>4.2.1.RELEASE</spring.version>