pnpm v11 support

Feedback
1

Hi, My older projects in Vercel is failing because Vercel does not support pnpm v11. It would be nice if you add pnpm v11 support.

```log
Detected `pnpm-lock.yaml` 9 which may be generated by pnpm@9.x or pnpm@10.x

Using pnpm@9.x based on project creation date

To use pnpm@10.x, manually opt in using corepack (https://vercel.com/docs/deployments/configure-a-build#corepack)

Installing dependencies…

ERROR packages field missing or empty

For help, run: pnpm help install

Error: Command “pnpm install” exited with 1
```

2

Running into the same issue. With corepack enabled, I’d have expected Vercel to pick up the pinned pnpm version automatically.