Bump actions/upload-artifact from 4 to 5 (#95)

Author: dependabot[bot]

.github/workflows/pythonpackage.yml

@@ -159,7 +159,7 @@ jobs:
       - name: Build package
         run: |
           python -m build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           path: dist/*
           name: built-sdist