Update personDirectory version in gradle.properties

Person Directory version was upgraded in uPortal 5.17.1 release.

Author: bjagg

gradle.properties

@@ -31,7 +31,9 @@ notificationWebComponentsVersion=1.0.4
 tomcatVersion=8.5.100
 servletApiDependency=javax.servlet:javax.servlet-api:3.0.1
 ccppVersion=1.0
-personDirectoryVersion=1.8.14
+
+# Dependencies driven by uPortal
+personDirectoryVersion=1.8.16
 
 # Dependencies driven by Pluto Portlet Engine version
 plutoVersion=2.1.0-M3