Update actions/configure-pages action to v2

Author: renovate[bot]

.github/workflows/GHPages.yml

@@ -35,7 +35,7 @@ jobs:
           yarn pre-build
           yarn build
       - name: Setup Pages
-        uses: actions/configure-pages@v1
+        uses: actions/configure-pages@v2
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1
         with: