[AIRFLOW-6719][WIP] Introduce pyupgrade to enforce latest syntax

[zhongjiajie]

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Issue link: AIRFLOW-6719

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[ashb]

Should we hold off on this PR until we are done with 1.10.x backports entirely, as that PR makes any future backports all but impossible.

[zhongjiajie]

Related PR #7343

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[zhongjiajie]

not stale, wait until backport packages finish

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[potiuk]

@zhongjiajie -> backports are fiinished. You can proceed with that :)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.