Fixed cookie value type

[magyarb]

Discussed in https://github.com/nuxt/framework/discussions/2576

The cookie.value is typed as string, so // @ts-ignore must be used to do this. I have fixed the types, so the cookie can be deleted without a ts error.

🔗 Linked issue

❓ 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

📝 Checklist

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

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[danielroe]

I've made a new PR to make a couple changes - see #8769. Feel free to merge them back into this PR if you would like - and in future please allow maintainers edit access to your PRs.

[pi0]

Merged via #8769. Thanks for PR ❤️