feat: v1.2.3

mmdet detectors expect xyxy bbox, SYSU format is xywh. We changed that
in the mmlab annotations generations.

Some minor changes:
- The Docker build script clears the docker volume
- Typo in comment in docker-compose.yml
- Do not include .git folder when copying the current folder in container during building.

src/cuhk_sysu_pedes/__init__.py

-__version__ = "1.2.2"
+__version__ = "1.2.3"