Update fullstack-authentication-with-next-js-and-cloudflare-d1.mdx

[deltaepsilon]

You need the { async: true } to get this working. It took me a while to figure that out.

[hyperlint-ai]

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PR Change Summary

Updated authentication implementation to require asynchronous context retrieval for Cloudflare D1 integration.

• Modified authentication code to use async context retrieval for API key and email settings.
• Ensured that the D1Adapter also utilizes the async context for database access.

Modified Files

• src/content/docs/developer-spotlight/tutorials/fullstack-authentication-with-next-js-and-cloudflare-d1.mdx

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