Huperniketes ci update 1

[huperniketes]

Fixes several issues preventing successful CI checks:

• outdated actions/checkout
• profile endpoint still returning User.username type as string | null
• unused Image import in index.tsx
• "lint" script in package.json lacked DATABASE_URL env var

[vercel]

@huperniketes is attempting to deploy a commit to the t3-oss Team on Vercel.

A member of the Team first needs to authorize it.