huggingface: fix _convert_TGI_message_to_LC_message issue, which will replace all …

[sywangyi]

…' in content like It's to It"s and cause json parser fail

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[sywangyi]

fix _convert_TGI_message_to_LC_message issue, which will replace all ' in content like It's to It"s and cause json parser fail

[efriis]

@Jofthomas

[yao-matrix]

ruff failed, pls fix it.

[yao-matrix]

@Jofthomas, could you pls review this PR? This makes some TGI-based RAG application failed, but vLLM is OK.