refactor(oracle): drop unused private alias, keep imports contiguous (CodeRabbit)

Author: Bartok9

core/wren/src/wren/connector/oracle.py

@@ -15,9 +15,6 @@
     oracledb = None
 
 from wren.connector.base import ConnectorABC, strip_trailing_semicolon
-
-# Back-compat private alias used by unit tests.
-_strip_trailing_semicolon = strip_trailing_semicolon
 from wren.model.error import DIALECT_SQL, ErrorCode, ErrorPhase, WrenError