update log4j version

Author: springMoon

pom.xml

@@ -22,7 +22,7 @@
         <gson.version>2.2.4</gson.version>
         <kudu.version>1.1-SNAPSHOT</kudu.version>
         <slf4j.version>1.7.21</slf4j.version>
-        <log4j.version>2.15.0</log4j.version>
+        <log4j.version>2.17.0</log4j.version>
     </properties>
 
     <dependencies>