Gemini By Example uses deprecated google.generativeai library

[MaskyS]

Thank you for your work!

Some of the examples are now outdated, for e.g. https://geminibyexample.com/029-rate-limits-retries/ , as retry.RetryConfig not available in the new SDK.

[MaskyS]

https://googleapis.github.io/python-genai/genai.html#genai.types.HttpRetryOptions