Fix integration tests

See: #1033

spring-session-core/spring-session-core.gradle

@@ -25,5 +25,5 @@ dependencies {
 	testCompile "org.springframework.security:spring-security-core"
 	testCompile "org.junit.jupiter:junit-jupiter-api"
 	testCompile "org.junit.jupiter:junit-jupiter-params"
-	testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine"
+	testRuntime "org.junit.jupiter:junit-jupiter-engine"
 }