Remove duplicate license header in abstract.py

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: febus982

sqlalchemy_bind_manager/_repository/abstract.py

@@ -18,15 +18,6 @@
 #  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 #  DEALINGS IN THE SOFTWARE.
 
-#
-#  Permission is hereby granted, free of charge, to any person obtaining a
-#  copy of this software and associated documentation files (the "Software"),
-#  to deal in the Software without restriction, including without limitation
-#  the rights to use, copy, modify, merge, publish, distribute, sublicense,
-#  and/or sell copies of the Software, and to permit persons to whom the
-#  Software is furnished to do so, subject to the following conditions:
-#
-#
 from typing import (
     Any,
     Iterable,