Update to htmlunit-driver:2.31.0

Fixes: gh-5428

gradle/dependency-management.gradle

@@ -186,7 +186,7 @@ dependencyManagement {
 		dependency 'org.openid4java:openid4java-nodeps:0.9.6'
 		dependency 'org.ow2.asm:asm:6.0'
 		dependency 'org.reactivestreams:reactive-streams:1.0.1'
-		dependency 'org.seleniumhq.selenium:htmlunit-driver:2.30.0'
+		dependency 'org.seleniumhq.selenium:htmlunit-driver:2.31.0'
 		dependency 'org.seleniumhq.selenium:selenium-api:3.8.1'
 		dependency 'org.seleniumhq.selenium:selenium-java:3.11.0'
 		dependency 'org.seleniumhq.selenium:selenium-support:3.11.0'