Merge pull request #479 from plugwise/artifactv4

Try combining both actions to v4

Author: bouwew

.github/workflows/verify.yml

@@ -235,7 +235,7 @@ jobs:
           . venv/bin/activate
           pytest --log-level info tests/*.py --cov='.'
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage-${{ matrix.python-version }}
           path: .coverage
@@ -323,7 +323,7 @@ jobs:
           echo "Failed to restore Python virtual environment from cache"
           exit 1
       - name: Download all coverage artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
       - name: Combine coverage results
         run: |
           . venv/bin/activate