[pom] Updated log4j-core to 2.4

Author: hazendaz

pom.xml

@@ -176,7 +176,7 @@
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
-      <version>2.3</version>
+      <version>2.4</version>
       <optional>true</optional>
     </dependency>
     <dependency>