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

Commencez dans index.js vers la ligne 172, où gulp-cli suggère npm install lorsque node_modules est absent. Vérifiez la condition du lockfile du gestionnaire de paquets décrite dans l’issue et vérifiez qu’un projet avec pnpm-lock.yaml reçoit la suggestion pnpm install, tandis que le fallback existant reste inchangé.

Rédigé par le modèle d'indexation à partir du texte de l'issue.