chore(deps): update actions/upload-artifact action to v7

Author: renovate[bot]

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
       - name: Validate Firefox build (web-ext lint)
         run: pnpm --filter @marimo/extension exec web-ext lint --source-dir output/firefox-mv2 --self-hosted
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
           name: extension-zips
           path: apps/extension/output/*.zip