chore: upgrade to node 20 github actions

[gabriele-ct]

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Latest commit: 5b0db76e2ea2c4a30f09fc6b04a38a889e9687cb

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• https://docskit-ga-node20-github.commercetools.vercel.app (permalink to the last build of this branch)
• https://docskit-sha-eb67e99fd3aa05a69474773676d6865415b86d23.commercetools.vercel.app (this commit)