Support for short `pn/pnx` commands shipped with `pnpm@11`

[roll]

pnpm@11 has been shipped with 2 new short aliases pn/pnx (similar to e.g. uv/uvx). Would it be possible to enable it on Corepack?

References:

• https://github.com/orgs/pnpm/discussions/3383
• https://pnpm.io/blog/releases/11.0#new-commands