Upgrade spring-test to Hibernate ORM 5.3.6 (for JDK 11 compatibility)

Issue: SPR-16391

Author: jhoeller

spring-test/spring-test.gradle

@@ -60,7 +60,7 @@ dependencies {
 	testCompile("javax.ejb:javax.ejb-api:3.2")
 	testCompile("javax.interceptor:javax.interceptor-api:1.2.2")
 	testCompile("javax.mail:javax.mail-api:1.6.2")
-	testCompile("org.hibernate:hibernate-core:5.2.17.Final")
+	testCompile("org.hibernate:hibernate-core:5.3.6.Final")
 	testCompile("org.hibernate:hibernate-validator:6.0.13.Final")
 	// Enable use of the JUnit Platform Runner
 	testCompile("org.junit.platform:junit-platform-runner")