[questionanswering] drop support for 3.6

[DoHyun Kim (KdHyeon0661)]

Description

closes #25166

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[Deleted user (ghost)]

Thank you for your contribution KdHyeon0661! We will review the pull request and get back to you soon.

[Deleted user (ghost)]

All CLA requirements met.

[Krista Pratico (kristapratico)]

Thanks so much for your contribution! This looks good to me, I'm going to approve and merge. :)