bump uploard-artifact to v4 (#5)

Author: asottile-sentry

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
         set -x
         pip install build
         python -m build
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: ${{ github.sha }}
         path: dist/*