Bump Gradle to 5.1

Author: acogoluegnes

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

src/test/java/reactor/rabbitmq/RabbitFluxTests.java

@@ -577,7 +577,7 @@ public void senderWithCustomChannelCloseHandlerPriority(int nbMessages,
         sender = createSender(senderOptions);
         SendOptions sendOptions = new SendOptions().channelCloseHandler(channelCloseHandlerInSendOptions);
 
-        Publisher sendingResult = sendingCallback.apply(Tuples.of(sender, msgFlux, sendOptions));
+        Publisher<?> sendingResult = sendingCallback.apply(Tuples.of(sender, msgFlux, sendOptions));
 
         StepVerifier.create(sendingResult)
                 .expectNextCount(expectedCount)