Sync docs/package.json and docs/package-lock.json

[siddharthkp]

Looks like build & deploy were failing for a weeks: https://github.com/primer/css/commits/main.

It's because on Node 18 (which is what CI uses), package-lock.json was out of sync with package.json.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 977e764

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