Fix failing integration tests (#19068)

The vite/nuxt integration tests started failing because one of the
internal dependencies (`nuxi`) was updated from `3.28.0` to `3.29.0`
which includes a newer version of `undici` which in turn relies on
`node:sqlite`.

`node:sqlite` was added in a newer Node version, and we still use Node
v20 in CI.

This PR pins `nuxi` to `3.28.0` until we can upgrade our Node version in
CI.

[ci-all]