Suggest pnpm in missing modules error

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### What were you expecting to happen?

If node_modules aren't present and `pnpm-lock.yaml` is present, gulp-cli should say "Try running: pnpm install"

### What actually happened?

It defaults to suggesting "npm install". The issue is [this line](https://github.com/gulpjs/gulp-cli/blob/master/index.js#L172).

### Please give us a sample of your gulpfile
N/A

### Terminal output / screenshots

### Please provide the following information:
N/A - This happens in any environment.

### Additional information
N/A

Empieza en index.js alrededor de la línea 172, donde gulp-cli sugiere npm install cuando falta node_modules. Comprueba la condición del lockfile del gestor de paquetes descrita en el issue y verifica que un proyecto con pnpm-lock.yaml reciba la sugerencia pnpm install, mientras que el fallback existente permanece sin cambios.

Escrito por el modelo de indexación a partir del texto del issue.