refactor: 불필요한 어노테이션 삭제

Author: m-a-king

src/main/java/com/somemore/volunteer/service/SignOutVolunteerService.java

@@ -22,7 +22,7 @@ public class SignOutVolunteerService implements SignOutVolunteerUseCase {
     @Override
     public void signOut(
             HttpServletResponse response,
-            @AuthenticationPrincipal String volunteerId) {
+            String volunteerId) {
 
         cookieUseCase.deleteAccessToken(response);
         refreshTokenManager.removeRefreshToken(volunteerId);