chore: upgrade uportal to v5.16.1 (#662)

Author: bjagg

gradle.properties

@@ -19,7 +19,7 @@ resourceServerVersion=1.0.48
 # Includes newer front-end dependencies and web components
 resourceServerWebjarVersion=1.5.0
 simpleContentPortletVersion=3.4.0
-uPortalVersion=5.15.1
+uPortalVersion=5.16.1
 webProxyPortletVersion=2.4.0
 
 # Versions of WebJars included with resource-server