[FLINK-38594][python] stop false positive unused import causing error in CI

Signed-off-by: davidradl <[email protected]>

Author: davidradl

flink-python/pyflink/table/tests/test_udf.py

@@ -20,7 +20,8 @@
 import unittest
 import uuid
 
-import pytz
+# false positive Error in Flake8.
+import pytz # noqa: F401
 
 from pyflink.common import Row
 from pyflink.table import DataTypes, expressions as expr