update code

src/ebook/extract_book_code.py

@@ -13,7 +13,7 @@ def extract_code():
     # with open(book_mapping_path, "r") as f:
     #     book_mapping = json.load(f)
     book_mapping = {
-        "深入剖析Nginx": "08fd0c7025a4a34a97a29897b067d24",
+        "深入剖析Nginx": "608fd0c7025a4a34a97a29897b067d24",
     }
     for book_idx, book_name in enumerate(book_mapping.keys()):
         book_dir_name = book_name