Update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/upload-legacy-ami.yml

@@ -123,7 +123,7 @@ jobs:
       - name: Describe images
         run: nix run .#describe-images > ./site/images.json
       - name: Upload pages
-        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
+        uses: actions/upload-pages-artifact@7b1f4a764d45c48632c6b24a0339c27f5614fb0b # v4.0.0
         with:
           path: ./site
       - name: Deploy pages