Update pr.yml

update from version 18 to 20

Author: csmlo

.github/workflows/pr.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v3
         with:
-          node-version: "18"
+          node-version: "20"
           cache: ${{ steps.detect-package-manager.outputs.manager }}
       - name: Setup Pages
         uses: actions/configure-pages@v2