Update to assertj-core:3.11.1

Fixes gh-5780

gradle/dependency-management.gradle

@@ -143,7 +143,7 @@ dependencyManagement {
 		dependency 'org.aspectj:aspectjrt:1.9.1'
 		dependency 'org.aspectj:aspectjtools:1.9.1'
 		dependency 'org.aspectj:aspectjweaver:1.9.1'
-		dependency 'org.assertj:assertj-core:3.11.0'
+		dependency 'org.assertj:assertj-core:3.11.1'
 		dependency 'org.attoparser:attoparser:2.0.4.RELEASE'
 		dependency 'org.bouncycastle:bcpkix-jdk15on:1.60'
 		dependency 'org.bouncycastle:bcprov-jdk15on:1.58'