Bump actions/setup-node from 5 to 6 (#258)

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Author: dependabot[bot]

.github/workflows/deploy-11ty-pages.yml

@@ -24,7 +24,7 @@ jobs:
           pip install -e '.[all]'
 
       - name: Setup Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "18.x"