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

.github/workflows/pythonpackage.yml

@@ -51,7 +51,7 @@ jobs:
         source ./helics_apps-pip/packaging_scripts/setup-${{ runner.os  }}.sh "$(cat HELICS_VERSION)" "${{ matrix.arch }}"
         ./helics_apps-pip/packaging_scripts/build-${{ runner.os }}.sh "${{ matrix.plat_name }}"
         ./helics_apps-pip/packaging_scripts/repair-${{ runner.os }}.sh
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: apps-python-dist
         path: upload-wheelhouse
@@ -76,7 +76,7 @@ jobs:
         python setup.py sdist
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: apps-python-dist
         path: helics_apps-pip/dist/*.tar.gz