Blissdata no longer has a __version__ since 2.0.0rc2

python -c "import blissdata;blissdata.__version__"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: module 'blissdata' has no attribute '__version__'

Use proper way of discovering package versions. Like https://gitlab.esrf.fr/workflow/ewoksapps/ewoksdata/-/blob/main/src/ewoksdata/data/blissdata/__init__.py