Upgrades log4j to 2.16.0 (helidon-io#3736)

Signed-off-by: Laird Nelson <laird.nelson@oracle.com>

Author: ljnelson

dependencies/pom.xml

@@ -96,7 +96,7 @@
         <version.lib.junit4>4.13.1</version.lib.junit4>
         <version.lib.junit>5.7.0</version.lib.junit>
         <version.lib.kafka>2.8.1</version.lib.kafka>
-        <version.lib.log4j>2.15.0</version.lib.log4j>
+        <version.lib.log4j>2.16.0</version.lib.log4j>
         <version.lib.logback>1.2.3</version.lib.logback>
         <version.lib.mariadb-java-client>2.6.2</version.lib.mariadb-java-client>
         <version.lib.maven-wagon>2.10</version.lib.maven-wagon>