Upgrade: Bump actions/deploy-pages from 2 to 4 (#159)

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Author: dependabot[bot]

.github/workflows/GHPages.yml

@@ -47,4 +47,4 @@ jobs:
 
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2
+        uses: actions/deploy-pages@v4