fix: task is not created if user does not refer directly

https://docs.gradle.org/current/userguide/task_configuration_avoidance.html

src/main/groovy/com/github/spotbugs/snom/internal/SpotBugsTaskFactory.java

@@ -47,7 +47,7 @@ private void generateForJava(Project project, Action<? super SpotBugsTask> confi
                         log.debug("Creating SpotBugsTaskForJava for {}", sourceSet);
                         project
                             .getTasks()
-                            .register(
+                            .create(
                                 name,
                                 SpotBugsTask.class,
                                 task -> {