Bump version to v3.8.0

Author: laughingman7743

pyathena/__init__.py

@@ -10,7 +10,7 @@
     from pyathena.connection import Connection, ConnectionCursor
     from pyathena.cursor import Cursor
 
-__version__ = "3.7.0"
+__version__ = "3.8.0"
 user_agent_extra: str = f"PyAthena/{__version__}"
 
 # Globals https://www.python.org/dev/peps/pep-0249/#globals