[CLN] Refactor version import in __init__.py

Replaced gempy version import with a local _version module import for improved modularity and clarity. Removed unnecessary dependency on the gempy module in __init__.py.

Author: Leguark

gempy_probability/__init__.py

@@ -1,3 +1 @@
-import gempy
-
-__version__ = gempy.__version__
+from ._version import __version__