⬆️ deps: Update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/pytest.yml

@@ -63,7 +63,7 @@ jobs:
       # Upload coverage
       # ---------------------------------------------
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
 
       # ---------------------------------------------
       # Always show server log