테스트 코드 설정 수정

src/test/java/com/tiketeer/Tiketeer/domain/purchase/usecase/CreatePurchaseOLockUseCaseTest.java

@@ -64,7 +64,7 @@ void createPurchaseWithConcurrency() throws InterruptedException {
 					.ticketingId(ticketing.getId())
 					.memberEmail(email)
 					.count(1)
-					.backoff(10L)
+					.backoff(300L)
 					.maxAttempts(100)
 					.build()));