Bumped action version

Author: vladvildanov

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
         pytest --junitxml=test-results.xml
     - name: Upload test results
       if: always()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test-results
         path: test-results.xml