CI: Update scientific-python/upload-nightly-action from 0.3.0 to 0.4.0 (

networkx#7309)

* Update the scientific-python/upload-nightly-action to v0.4.0 to avoid issues
  with uploading wheels of the same name to Anaconda Cloud where the project
  being uploaded to only contains one wheel (the one being replaced).
   - c.f. https://github.com/scientific-python/upload-nightly-action/releases/tag/0.4.0

.github/workflows/nightly.yml

@@ -27,7 +27,7 @@ jobs:
       - name: List contents of wheel
         run: python -m zipfile --list dist/networkx-*.whl
       - name: Upload nighlty wheel
-        uses: scientific-python/upload-nightly-action@6e9304f7a3a5501c6f98351537493ec898728299 # 0.3.0
+        uses: scientific-python/upload-nightly-action@95f7bf6a22281b8072fae929429dd0408f09ea63 # 0.4.0
         with:
           anaconda_nightly_upload_token: ${{ secrets.ANACONDA_NIGHTLY }}
           artifacts_path: dist/