Update website.yml

Pinning action to a full length commit SHA [see](https://docs.github.com/en/actions/security-for-github-actions/security-guides/security-hardening-for-github-actions#using-third-party-actions)

Author: ismisepaul

.github/workflows/website.yml

@@ -30,6 +30,6 @@ jobs:
           cd ..
           cp -R docs demo/dist
       - name: Deploy website
-        uses: JamesIves/github-pages-deploy-action@v4
+        uses: JamesIves/github-pages-deploy-action@6c2d9db40f9296374acc17b90404b6e8864128c8  # v4.7.3
         with:
           folder: demo/dist