Fix backward compatibility for timeout in defer() with Airflow 2.11

[amoghrajesh]

Main is failing with errors like these:

_ TestTimeDeltaSensorAsync.test_timedelta_sensor_async_run_after_vs_interval[run_after0-interval_end0] _
providers/standard/tests/unit/standard/sensors/test_time_delta.py:185: in test_timedelta_sensor_async_run_after_vs_interval
    op.execute(context)
/usr/local/lib/python3.9/site-packages/airflow/models/baseoperator.py:424: in wrapper
    return func(self, *args, **kwargs)
/usr/local/lib/python3.9/site-packages/airflow/providers/standard/sensors/time_delta.py:137: in execute
    self.defer(
/usr/local/lib/python3.9/site-packages/airflow/models/baseoperator.py:1800: in defer
    raise TaskDeferred(trigger=trigger, method_name=method_name, kwargs=kwargs, timeout=timeout)
/usr/local/lib/python3.9/site-packages/airflow/exceptions.py:431: in __init__
    raise ValueError("Timeout value must be a timedelta")
E   ValueError: Timeout value must be a timedelta

• In 2.11, timeout must be a timedelta | None

• In 3.0, timeout can be timedelta | int | float | None

It seems the conditional is wrong and should be flipped

Example failures: https://github.com/apache/airflow/actions/runs/15152977665/job/42602642810

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