chore: fix pnpm requirements in CONTRIBUTING.md

[xiaohanyu]

Summary

use pnpm other than 9.x will report an error.

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

Your pnpm version is incompatible with "/Users/hanyu/github/logto-io/logto".

Expected version: ^9.0.0
Got: 10.6.2

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".

ref commit:
silverhand-io/essentials@2171b96

Testing

Checklist

• .changeset
• unit tests
• integration tests
• necessary TSDoc comments

[github-actions]

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.github/CONTRIBUTING.md	0 Bytes