Bump actions/upload-artifact from 3 to 4 (#20)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
         - run: python -O once_test.py
         - run: python -OO once_test.py
         - name: Upload pytest test results
-          uses: actions/upload-artifact@v3
+          uses: actions/upload-artifact@v4
           if: success() || failure()
           with:
             name: test-py${{ matrix.python-version}}-on-${{ matrix.os }}