[Fix] import regex instead of re (#19875)

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>

vllm/entrypoints/openai/tool_parsers/xlam_tool_parser.py

 # SPDX-License-Identifier: Apache-2.0
 # ruff: noqa
 import json
-import re
 from collections.abc import Sequence
 from typing import Any, Dict, List, Optional, Union
 
+import regex as re
+
 from vllm.entrypoints.openai.protocol import (ChatCompletionRequest,
                                               DeltaFunctionCall, DeltaMessage,
                                               DeltaToolCall,