fix(ci): make pnpm work again

[wmertens]

this fixes the problems caused by nodejs/corepack#612

We no longer rely on corepack to get the correct pnpm version, and we hope that pnpm/action-setup@v4 will do the right thing.

[changeset-bot]

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Latest commit: dd5ab08

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[pkg-pr-new]

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commit: dd5ab08

[gioboa]

It looks good to me
@wmertens thanks