bertek

Update python formatting to use .format() instead of f-strings

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## Motivation This pull request addresses formatting issues in visual_chatgpt.py that were causing errors, including syntax errors. Specifically, some parts of the code were using f-strings for string formatting, which...

servery.py on_event deprecated

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## Issue Description: The on_event decorator used in [langserve/server.py](https://github.com/langchain-ai/langserve/blob/90bf613711c873e640bfa3224d013532744288a4/langserve/server.py#L46) is deprecated. As of the current FastAPI version, lifespan event handlers should be used instead of on_event. This change is in...