Update log4j to 2.17 (#6438)

(cherry picked from commit 91cdcf2)

Author: rawlinp

Diff for: CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ## [5.1.5] - 2021-12-20
-- Updated `log4j` module in Traffic Router from version 1.2.17 to 2.16.0
+- Updated `log4j` module in Traffic Router from version 1.2.17 to 2.17.0
 
 ## [5.1.4] - 2021-11-05
 - Traffic Ops: Sanitize username before executing LDAP query

Diff for: traffic_router/pom.xml

@@ -33,7 +33,7 @@
 	<properties>
 		<deploy.dir>/opt/traffic_router</deploy.dir>
 		<spring.version>5.2.9.RELEASE</spring.version>
-		<log4j.version>2.16.0</log4j.version>
+		<log4j.version>2.17.0</log4j.version>
 		<junit.version>4.12</junit.version>
 		<hamcrest.version>1.3</hamcrest.version>
 		<geoip2.version>2.1.0</geoip2.version>