Update download-artifact action to v4

Author: austenstone

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       id-token: write
     steps:
       - name: Download artifact
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: dist
       - name: Setup Pages