chore(go): fix broken samples

[hugoaguirre]

Description here... Help the reviewer by:

• linking to an issue that includes more details
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Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[gemini-code-assist]

Summary of Changes

Hello @hugoaguirre, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves issues in the Go samples by updating the Anthropic model to a specific version and configuring a maximum token limit for its responses. These adjustments are crucial for maintaining compatibility and proper functionality of the sample code with the Anthropic API.

Highlights

• Model Version Update: The Anthropic model identifier in the jokesFlow sample has been updated from claude-3-5-sonnet-v2 to claude-3-5-sonnet-v2@20241022 to use a specific version.
• Model Configuration: A MaxTokens parameter with a value of 1024 has been added to the anthropic.MessageNewParams configuration for the Anthropic model, ensuring a limit on the generated response length.

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[gemini-code-assist]

Code Review

This pull request fixes a broken sample by updating the model name and adding a MaxTokens parameter. The changes are correct, but I have a couple of suggestions to improve the code quality of the sample by using constants for magic strings and numbers. Using constants makes the code more readable and maintainable, which is a good practice to demonstrate in sample code.

[gemini-code-assist]

The expression *anthropic.IntPtr(1024) seems unnecessarily complex. The MaxTokens field on anthropic.MessageNewParams is of type int, so you can directly use the integer value.

Also, to improve readability and avoid magic numbers, consider defining 1024 as a named constant.

For example:

const maxOutputTokens = 1024

Suggested change

	MaxTokens: *anthropic.IntPtr(1024),
	MaxTokens: 1024,