chore: Java 스타일 수정

Author: github-actions

backend/src/main/java/io/f1/backend/domain/game/sse/app/SseService.java

@@ -44,12 +44,16 @@ public <T> void notifyLobbyUpdate(LobbySseEvent<T> event) {
     }
 
     private void startHeartBeat(SseEmitter emitter) {
-        scheduler.scheduleAtFixedRate(() -> {
-            try {
-                emitter.send(SseEmitter.event().name("heartbeat").data("sse-alive"));
-            } catch (IOException e) {
-                emitterRepository.remove(emitter);
-            }
-        }, 5, 30, TimeUnit.SECONDS);
+        scheduler.scheduleAtFixedRate(
+                () -> {
+                    try {
+                        emitter.send(SseEmitter.event().name("heartbeat").data("sse-alive"));
+                    } catch (IOException e) {
+                        emitterRepository.remove(emitter);
+                    }
+                },
+                5,
+                30,
+                TimeUnit.SECONDS);
     }
 }