Remove mutation tests from CI

.github/workflows/python-ci.yml

@@ -80,11 +80,6 @@ jobs:
         run: |
           pytest ${STRESS_ARGS} --cov=src --cov-report=xml --cov-report=term-missing \
             --cov-fail-under=20 src/tests
-      - name: Run mutation tests
-        if: github.event_name == 'push' && runner.os == 'Linux'
-        run: |
-          python -m mutmut run --paths-to-mutate src --tests-dir src/tests --runner "python -m pytest -q" --use-coverage --no-progress
-          python -m mutmut results
       - name: Upload coverage report
         uses: actions/upload-artifact@v4
         with: