Update to OpenSAML 3.4.6

Closes gh-9607

gradle/dependency-management.gradle

@@ -193,9 +193,9 @@ dependencyManagement {
 		dependency 'org.mockito:mockito-core:3.0.0'
 		dependency 'org.objenesis:objenesis:2.6'
 		dependency 'org.openid4java:openid4java-nodeps:0.9.6'
-		dependency 'org.opensaml:opensaml-core:3.4.5'
-		dependency 'org.opensaml:opensaml-saml-api:3.4.5'
-		dependency 'org.opensaml:opensaml-saml-impl:3.4.5'
+		dependency 'org.opensaml:opensaml-core:3.4.6'
+		dependency 'org.opensaml:opensaml-saml-api:3.4.6'
+		dependency 'org.opensaml:opensaml-saml-impl:3.4.6'
 		dependency 'org.ow2.asm:asm:6.2.1'
 		dependency 'org.reactivestreams:reactive-streams:1.0.3'
 		dependency 'org.seleniumhq.selenium:htmlunit-driver:2.36.0'