Bump test libraries

Author: acogoluegnes

build.gradle

@@ -45,10 +45,10 @@ ext {
 	springAmqpVersion = '2.2.1.RELEASE'
 
 	// Testing
-	mockitoVersion = '3.0.0'
+	mockitoVersion = '3.1.0'
 	junitPlatformVersion = '1.5.2'
 	junitJupiterVersion  = '5.5.2'
-	assertjVersion = '3.13.2'
+	assertjVersion = '3.14.0'
 
 	javadocLinks = ["https://docs.oracle.com/javase/7/docs/api/",
 					"https://docs.oracle.com/javaee/6/api/",