Revert "Work around https://issues.jboss.org/browse/WFLY-8515"

This reverts commit 874b1f4870. A
change has been made to Spring Framework to work around the problem.
As a result, this workaround is no longer necessary.

spring-boot-deployment-tests/spring-boot-deployment-test-wildfly/pom.xml

@@ -38,10 +38,6 @@
 			<artifactId>javax.servlet-api</artifactId>
 			<scope>provided</scope>
 		</dependency>
-		<dependency>
-			<groupId>org.reactivestreams</groupId>
-			<artifactId>reactive-streams</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>