ci(github): bump actions/setup-node from 4 to 6 (#1077)

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Author: dependabot[bot]

.github/workflows/deploy-docs.yml

@@ -24,7 +24,7 @@ jobs:
         uses: pnpm/action-setup@v5
 
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version-file: '.nvmrc'
           cache: pnpm