Bump test dependencies

Author: acogoluegnes

build.gradle

@@ -46,8 +46,8 @@ ext {
 	// Testing
 	mockitoVersion = '3.7.7'
 	junitPlatformVersion = '1.7.0'
-	junitJupiterVersion  = '5.7.0'
-	assertjVersion = '3.18.1'
+	junitJupiterVersion  = '5.7.1'
+	assertjVersion = '3.19.0'
 
 	javadocLinks = ["https://docs.oracle.com/javase/8/docs/api/",
 					"https://www.reactive-streams.org/reactive-streams-1.0.3-javadoc/",