Leonardo Gago

Hello! In the ChatGoogleAI is wrong the default endpoint. https://github.com/brainlid/langchain/blob/48add20d097cb0ade21b311a2c5c9bbd61000e93/lib/chat_models/chat_google_ai.ex#L24-L26 https://github.com/brainlid/langchain/blob/48add20d097cb0ade21b311a2c5c9bbd61000e93/lib/chat_models/chat_google_ai.ex#L32-L36 Then, when the final url is geneated, the `version` is added again: https://github.com/brainlid/langchain/blob/48add20d097cb0ade21b311a2c5c9bbd61000e93/lib/chat_models/chat_google_ai.ex#L338-L342 This PR only define `@default_endpoint` with...