[docker] Update test gradle file with the new style way to do things, which involves marking lombok explicitly as an annotation processor (via github user tagae: Sebastián González)

docker/gradle/files/build.gradle

@@ -2,4 +2,5 @@ apply plugin: 'java'
 
 dependencies {
 	compileOnly files('lombok.jar')
+	annotationProcessor files('lombok.jar')
 }