all-repos: update actions/upload-artifact to v4 (#36)

Committed via https://github.com/asottile/all-repos

Author: joshuarli

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
     - run: |
         pip install build
         python -m build
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: ${{ github.sha }}
         path: dist/*