Update dependency apache-airflow to v2.8.1

This MR contains the following updates:

Package	Update	Change
apache-airflow (changelog)	patch	2.8.0 -> 2.8.1
apache-airflow (changelog)	patch	==2.8.0 -> ==2.8.1

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Release Notes

apache/airflow (apache-airflow)

v2.8.1

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