Bump version to 2.0.0a0 for pre-release integration

Co-authored-by: dimitri-yatsenko <dimitri@datajoint.com>

Author: claude

src/datajoint/version.py

@@ -1,6 +1,6 @@
 # version bump auto managed by Github Actions:
 # label_prs.yaml(prep), release.yaml(bump), post_release.yaml(edit)
 # manually set this version will be eventually overwritten by the above actions
-__version__ = "0.14.6"
+__version__ = "2.0.0a0"
 
 assert len(__version__) <= 10  # The log table limits version to the 10 characters