[python] Update python sdk version (#6406)

Author: yuzelin

paimon-python/pypaimon/__init__.py

@@ -19,7 +19,7 @@
 from pypaimon.catalog.catalog_factory import CatalogFactory
 from pypaimon.schema.schema import Schema
 
-__version__ = "0.3.dev"
+__version__ = "1.4.dev"
 __all__ = [
     "PaimonVirtualFileSystem",
     "CatalogFactory",