[FEAT/#79] 요청 DTO final 추가

src/main/java/org/sopt/seonyakServer/domain/appointment/controller/AppointmentController.java

@@ -30,15 +30,15 @@ public ResponseEntity<Void> postAppointment(
 
     @PatchMapping("/accept")
     public ResponseEntity<Void> acceptAppointment(
-            @RequestBody AppointmentAcceptRequest appointmentAcceptRequest
+            @RequestBody final AppointmentAcceptRequest appointmentAcceptRequest
     ) {
         appointmentService.acceptAppointment(appointmentAcceptRequest);
         return ResponseEntity.ok().build();
     }
 
     @PatchMapping("/reject")
     public ResponseEntity<Void> rejectAppointment(
-            @RequestBody AppointmentRejectRequest appointmentRejectRequest
+            @RequestBody final AppointmentRejectRequest appointmentRejectRequest
     ) {
         appointmentService.rejectAppointment(appointmentRejectRequest);
         return ResponseEntity.ok().build();