Remove a deprecated option from BigQueryHook.get_pandas_df

[RyuSA]

Why?

I found the method BigQueryHook.get_pandas_df threw a warning message.

/opt/python3.8/lib/python3.8/site-packages/airflow/providers/google/cloud/hooks/bigquery.py:269: FutureWarning: verbose is deprecated and will be removed in a future version. Set logging level in order to vary verbosity

BigQueryHook.get_pandas_df uses pandas_gbq.read_gbq to query BigQuery and convert rows into Frames. Now pandas_gbq.read_gbq throws the warning message if verbose is not None.

Also the version of pandas_gbq in Airflow GCP provider is latest. The project may fail when pandas_gbq removes the parameter verbose.

Any concerns?

Currently pandas_gbq.read_gbq seems not to handle the parameter. 👀 I believe this removal does not affect future releases.
https://github.com/googleapis/python-bigquery-pandas/blob/v0.19.2/pandas_gbq/gbq.py#L731

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[potiuk]

Pending tests passing.

[hussein-awala]

You need to update the unit tests

[amoghrajesh]

Looks good +1
Can you update the unit tests?

[RyuSA]

@potiuk @hussein-awala @amoghrajesh Thank you for taking a look.👍 I have added some changes to pass the CI.

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.