Use upload-artifact v4

Author: aaltat

.github/workflows/CI.yml

@@ -45,8 +45,8 @@ jobs:
     - name: Run acceptance tests
       run: |
         python atest/run.py
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       if: ${{ always() }}
       with:
-        name: atest_results
+        name: atest_results-${{ matrix.python-version }}-${{ matrix.rf-version }}
         path: atest/results