Fix old-style typing in Base Sensor (#27871)
Fix old-style typing in Base Sensor (#27871)

The new autoflake removes unused Iterable from sensor - because
it is used via old-style typing. Subsequently MyPy complains that
Iterable is not imported.

This PR converts typing to new-style to fix it.
apache/airflow,apache/airflow,apache/airflow,apache/airflow,apache/airflow,apache/airflow