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Move doc build dependencies to Doc/requirements.txt (GH-96607)

This makes 3.7 doc builds similar to later releases,
simplifying build tooling.
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Ned Deily committed
8feefc281f03c0f1af3422a8f0febb68edb145f2
Parent: 15ec1af
Committed by GitHub <noreply@github.com> on 9/6/2022, 6:34:50 AM