Update to pnpm version 10

[simolus3]

This adopts pnpm version 10 and switches to corepack to install it in GH actions instead of using an explicit setup step. That then allows using the package cache built in to actions/setup-node.

[changeset-bot]

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Latest commit: 4393e58

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[rkistner]

This is the first time I see the version catalogs feature - looks really useful for monorepos like this.