Bump actions/checkout from 4 to 6 (#1)

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Author: dependabot[bot]

.github/workflows/deploy-to-github-pages.yml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
         uses: actions/setup-node@v6