Bump actions/upload-artifact from 3 to 4 (#6)

* Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

* update upload-artifact to v4

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jeremy Leung <[email protected]>

.github/workflows/build.yaml

@@ -46,9 +46,10 @@ jobs:
           python -c "import lpath.lpath" &&
           echo "All done with import tests!"
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.whl
+          overwrite: true
 
   build_sdist:
     name: Build source distribution
@@ -79,9 +80,10 @@ jobs:
           python -c "import lpath.lpath" &&
           echo "All done with import tests!"
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz
+          overwrite: true
 
   upload_pypi:
     needs: [build_wheels, build_sdist]
@@ -99,6 +101,7 @@ jobs:
           # if `name: artifact` is omitted, the action will create extra parent dir
           name: artifact
           path: dist
+          merge-multiple: true
 
       - name: Publish distribution 📦 to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1