chore: upgrade pnpm to 9

[sommeeeer]

this PR bumps pnpm to 9.

btw, pnpm is giving a warning. should we remove workspaces from package.json? or is it used by something else?

 WARN  The "workspaces" field in package.json is not supported by pnpm. Create a "pnpm-workspace.yaml" file instead.

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[khuezy]

Yea I think we can remove the workspaces in package.json. We're using the pnpm-workspace.yaml

[khuezy]

LGTM thanks!

[conico974]

LGTM as well. Thanks
I'll merge this one after the release though, just in case