Fix SMTP hook test_connection

[messense]

noop() returns a (code, message) tuple.

[boring-cyborg]

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[messense]

The mypy error is confusing? The typeshed for noop() is tuple[int, bytes]

https://github.com/python/typeshed/blob/017aed4dceade7e7dc9880b5182a516e01e135f6/stdlib/smtplib.pyi#L30

while mypy gives:

providers/smtp/src/airflow/providers/smtp/hooks/smtp.py:279: error: "Coroutine[Any, Any, SMTPResponse]" object is not iterable  [misc]
                      status, _message = smtp_client.noop()
                                         ^~~~~~~~~~~~~~~~~~
  Found 1 error in 1 file (checked 4026 source files)

[github-actions]

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