Allow pnpm 9: ERR_PNPM_UNSUPPORTED_ENGINE

[jpdreamos]

$ pnpm install -r

ERR_PNPM_UNSUPPORTED_ENGINE  Unsupported environment (bad pnpm and/or Node.js version)

Your pnpm version is incompatible with "/Users/madhava/Sites/dream/sdk".

Expected version: ^8.0.0
Got: 9.4.0

This is happening because the package's manifest has an engines.pnpm field specified.
To fix this issue, install the required pnpm version globally.

To install the latest version of pnpm, run "pnpm i -g pnpm".
To check your pnpm version, run "pnpm -v".

pnpm installation defaults to version 9 since April 2024. I don't want to have to downgrade to 8, so support for 9 out of the box would be nice.

I was able to work around this by making this change to the root package.json:

  "engines": {
    "node": ">=18.0.0",
    "npm": "^8.0.0",
    "pnpm": "^9.0.0"
  },