[CI] Fix re import error (#29973)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

.buildkite/scripts/generate-nightly-index.py

@@ -7,13 +7,14 @@
 
 import argparse
 import json
-import re
 import sys
 from dataclasses import asdict, dataclass
 from pathlib import Path
 from typing import Any
 from urllib.parse import quote
 
+import regex as re
+
 if not sys.version_info >= (3, 12):
     raise RuntimeError("This script requires Python 3.12 or higher.")