Auto-installation step should respect current package manager

[yeskunall]

Current Behavior

If I use pnpm (pnpx dts-cli create <package_name>)—instead of npm (npx dts-cli create <package_name>)—then the auto-installation of packages uses npm by default

Expected behavior

Expected the auto-installation step to also use pnpm (and not npm)

Suggested solution(s)

Use the right (the package manager for auto-installation, or just drop the feature altogether

Additional context

N/A

Your environment

N/A for this bug report