fix: functions that return promises must be async

[thomaslindstrom]

☕️ Reasoning

Fixes an eslint error. Also, the release script failed because of this issue. It hopefully works now. See https://github.com/nextauthjs/next-auth/actions/runs/11465703605/job/31904743372#step:7:39

🧢 Checklist

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

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Name	Status	Preview	Comments	Updated (UTC)
auth-docs	❌ Failed (Inspect)			Oct 23, 2024 9:32am
next-auth-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 23, 2024 9:32am

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