[Bug]: AutoGen Gemini Notebook doesn't work with 0.4

### File Name

`gemini/orchestration/autogen_gemini.ipynb`

### What happened?

AutoGen Notebook with Gemini no longer works with the latest release of AutoGen (There were a lot of breaking changes since `0.2`)

https://microsoft.github.io/autogen/stable/user-guide/agentchat-user-guide/migration-guide.html

Even using their suggested workaround to keep using the old framework doesn't seem to work in this notebook.

Please update it to Gemini 2.0 Flash and the latest version of the framework.

### Code of Conduct

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