fix(provider): update tiktok token url

[mwawrusch]

☕️ Reasoning

Tiktok provider breaks the app. This PR should fix it.

🧢 Checklist

• [ ] Documentation
• [ ] Tests
• [ ] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 28, 2024 3:45pm

1 Ignored Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **next-auth-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/authjs/next-auth-docs/8traTPpWryoZn1yYEjcLfnoh2nHq)) | [Visit Preview](https://next-auth-docs-git-fork-mwawrusch-patch-3-authjs.vercel.app) | | Apr 28, 2024 3:45pm |

[vercel[bot]]

@ndom91 is attempting to deploy a commit to the authjs Team on Vercel.

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[ndom91]

Tried to test this, but my TikTok app needed to be resubmitted to add the scopes :sweat_smile:

Will come back to this when we have an app to test with :pray: