Update to gunicorn_h1c >= 0.6.3 which adds InvalidChunkExtension
validation for rejecting chunk extensions with bare CR bytes per
RFC 9112.
Changes:
- Update pyproject.toml to require gunicorn_h1c >= 0.6.3
- Add InvalidChunkExtension exception to gunicorn/asgi/parser.py
- Handle InvalidChunkExtension from both Python and C parsers in protocol.py
- Add chunk extension validation tests
- Update treq.py badrequest class to support hex escapes
