[NO ISSUE] Update log4j2 dependencies 2.15.0 -> 2.16.0

Change-Id: I132118b602908d28ce559a3a32ed1688b1ce5a29
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/14564
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ian Maxon <imaxon@uci.edu>
Reviewed-by: Michael Blow <mblow@apache.org>
diff --git a/asterixdb/pom.xml b/asterixdb/pom.xml
index 64b4f0f..22b1784 100644
--- a/asterixdb/pom.xml
+++ b/asterixdb/pom.xml
@@ -86,7 +86,7 @@
     <hyracks.version>0.3.7-SNAPSHOT</hyracks.version>
     <hadoop.version>3.3.1</hadoop.version>
     <jacoco.version>0.7.6.201602180812</jacoco.version>
-    <log4j.version>2.15.0</log4j.version>
+    <log4j.version>2.16.0</log4j.version>
     <awsjavasdk.version>2.17.79</awsjavasdk.version>
     <parquet.version>1.12.0</parquet.version>
     <hadoop-awsjavasdk.version>1.12.109</hadoop-awsjavasdk.version>
diff --git a/hyracks-fullstack/pom.xml b/hyracks-fullstack/pom.xml
index cc5f1aa..bb17a60 100644
--- a/hyracks-fullstack/pom.xml
+++ b/hyracks-fullstack/pom.xml
@@ -72,7 +72,7 @@
     <!-- Versions under dependencymanagement or used in many projects via properties -->
     <hadoop.version>3.3.1</hadoop.version>
     <jacoco.version>0.7.6.201602180812</jacoco.version>
-    <log4j.version>2.15.0</log4j.version>
+    <log4j.version>2.16.0</log4j.version>
     <snappy.version>1.1.8.4</snappy.version>
     <jackson.version>2.13.0</jackson.version>