chore: upgrade example to Docker Compose v2 (#39372)
chore: upgrade example to Docker Compose v2 (#39372)

Upgrade the README to use Docker Compose v2, which is faster and shipped by default with Docker Desktop since April.

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm lint`
- [x] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

JeromeFitz/next.js,JeromeFitz/next.js,JeromeFitz/next.js,JeromeFitz/next.js