refactor(blob): remove undici fetch

[luismeyer]

Node.js 16 is deprecated since January 31, 2025. We can remove the undici dependency now and rely on the node.js fetch.

https://vercel.com/changelog/node-js-16-deprecation

[changeset-bot]

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Latest commit: 3285dad

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[vvo]

Closing very old PRs, if this is a very important PR you can discuss it and reopen it 🙏

I don't want to keep you waiting here, atm no-one is maintaining the kv/postgresql clients as we're migrating towards neon/upstash marketplace: https://vercel.com/blog/introducing-the-vercel-marketplace#what%E2%80%99s-next-for-vercel-postgres-and-vercel-kv

We recommend folks moving to native clients for neon/upstash, thanks!