Bump test dependencies

Author: acogoluegnes

build.gradle

@@ -43,9 +43,9 @@ ext {
 	springAmqpVersion = '2.2.10.RELEASE'
 
 	// Testing
-	mockitoVersion = '3.5.10'
-	junitPlatformVersion = '1.6.2'
-	junitJupiterVersion  = '5.6.2'
+	mockitoVersion = '3.5.15'
+	junitPlatformVersion = '1.7.0'
+	junitJupiterVersion  = '5.7.0'
 	assertjVersion = '3.17.2'
 
 	javadocLinks = ["https://docs.oracle.com/javase/8/docs/api/",