Upgrade to AssertJ 3.17.1

Author: jhoeller

build.gradle

@@ -179,7 +179,7 @@ configure(allprojects) { project ->
 			dependency "org.testng:testng:6.14.3"
 			dependency "org.hamcrest:hamcrest:2.1"
 			dependency "org.awaitility:awaitility:3.1.6"
-			dependency "org.assertj:assertj-core:3.16.1"
+			dependency "org.assertj:assertj-core:3.17.1"
 			dependencySet(group: 'org.xmlunit', version: '2.6.2') {
 				entry 'xmlunit-assertj'
 				entry('xmlunit-matchers') {