Use gemini-1.5-flash-latest in google_generative_ai_conversation.generate_content

[tronikos]

Breaking change

Proposed change

The google_generative_ai_conversation.generate_content couldn't be tied to a config entry earlier because it had to use the specific vision model when an image was passed. Now all the 1.5 are multimodal. Switch to using the default gemini-1.5-flash-latest. The docs already mention custom prompt and model settings don't apply to this service. A later PR could tie this to a config entry but that would be a breaking change. Better to wait until we figure out a generic way to handle multimodal across the different integrations though.

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[tronikos]

Can you please include this to the upcoming release? It would be better for paying users to use one model because I think you are getting charged per model per million tokens https://ai.google.dev/pricing