fix: participation 어노테이션 설정 오류 고침

src/main/java/com/bapMate/bapMateServer/domain/participation/entity/Participation.java

@@ -14,7 +14,7 @@
 @Entity
 public class Participation extends BaseTimeEntity {
     @Id
-    @GeneratedValue
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "participation_id")
     private Long id;