Update to Selenium 3.12.0

Fixes: gh-5427

gradle/dependency-management.gradle

@@ -175,9 +175,8 @@ dependencyManagement {
 		dependency 'org.ow2.asm:asm:6.0'
 		dependency 'org.reactivestreams:reactive-streams:1.0.1'
 		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'
+		dependency 'org.seleniumhq.selenium:selenium-java:3.12.0'
+		dependency 'org.seleniumhq.selenium:selenium-support:3.12.0'
 		dependency 'org.skyscreamer:jsonassert:1.5.0'
 		dependency 'org.slf4j:jcl-over-slf4j:1.7.25'
 		dependency 'org.slf4j:jul-to-slf4j:1.7.25'