Feat: add update_student to service

backend/repository/student_sqlite_repository.py

@@ -26,10 +26,11 @@ class StudentSQLiteRepository(AbstractRepository):
     def update(self, student: Student) -> None:
         search_student = self.conn.execute(
             """
-                                           SELECT id FROM students WHERE id=:id
-                                           """,
+            SELECT id FROM students WHERE id=:id
+            """,
             {"id": student.id},
         ).fetchone()
+
         if search_student is None:
             raise StudentRepositoryError(f"The student ({student.id=}) does not exists")