HDDS-6104. Update log4j version to 2.16.0 version. (#2920)

(cherry picked from commit 09b06eb5608ab84bf1cedee21f2d4b2616f0464c)
diff --git a/pom.xml b/pom.xml
index ce5e2ca..05b8e67 100644
--- a/pom.xml
+++ b/pom.xml
@@ -133,7 +133,7 @@
     <!-- SLF4J/LOG4J version -->
     <slf4j.version>1.7.30</slf4j.version>
     <log4j.version>1.2.17</log4j.version>
-    <log4j2.version>2.15.0</log4j2.version>
+    <log4j2.version>2.16.0</log4j2.version>
     <disruptor.version>3.4.2</disruptor.version>
 
     <prometheus.version>0.7.0</prometheus.version>