chore: upgrade pnpm to version 8

[pradel]

I am using pnpm 8 on my machine which generates a different lockfile

[changeset-bot]

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Latest commit: 7e75c26

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
micro-stacks-docs	❌ Failed (Inspect)			Apr 11, 2023 10:07am

[pradel]

@aulneau I don't know how vercel is setup for micro-stacks, but pnpm 8 should work just fine there see https://vercel.com/changelog/automatic-pnpm-v8-support

[aulneau]

@pradel

[pradel]

@aulneau can you retry the build on vercel with the prune cache option to see if it fixes it?

[pradel]

@aulneau vercel passed, now the ci is failing as it is trying to install the "main" branch deps with the lockfile from this pr?