[BugFix] anthropic/serving_messages: fix tool call arguments streaming#34887

NickLucche merged 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

dtrifiro:fix-anthropic-streaming-tool-calls-mistraldtrifiro/vllm:fix-anthropic-streaming-tool-calls-mistralCopy head branch name to clipboard