fix(nuxt): allow usage of useFetch() function with FormData

[mrauhu]

Hello.

🔗 Linked issue

nuxt/nuxt#13839

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Resolves nuxt/nuxt#13839.

Example of usage after this fix is applied:

<script setup lang="ts">
async function formSubmit(event: Event & { target: HTMLFormElement }) {
  const body = new FormData(event.target);

  await useFetch('/', {
    method: 'POST',
    body,
  });
}
</script>

<template>
  <form id="example-form" method="post" @submit.prevent="formSubmit">
    <button type="submit">Send</button>
  </form>
</template>

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

Best wishes,
Sergey.

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[pi0]

Thanks for the PR <3 With #4955, we no longer use hash function in useFetch although I also made upstream issue (unjs/ohash#10) to track this.