[AIRFLOW-5489] Remove unneeded assignment of variable

[getras1998]

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• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-5489
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[getras1998]

@jghoman

[aijamalnk]

LGTM:) Thank you for your contribution Gerardo!