Summary
- libsigc++3 - update to version 3.4.0 (commit: 8c16f62) (details)
- Add pytest-black python project (commit: 842c418) (details)
- Add mypy python project (commit: ceb8995) (details)
- python/jsonschema: update to 4.17.3; rebuild to get package for python 3.5 obsoleted (commit: 15457f8) (details)