Bump actions/download-artifact from 3.0.2 to 4.0.0 (#144)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3.0.2 to 4.0.0.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3.0.2...v4.0.0)

---
updated-dependencies:
- dependency-name: actions/download-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>

.github/workflows/pythonpackage.yml

@@ -80,7 +80,7 @@ jobs:
       with:
         python-version: 3.8
     - name: Download coverage
-      uses: actions/download-artifact@v3.0.2
+      uses: actions/download-artifact@v4.0.0
       with:
         name: coverage
     - name: Coveralls