[issue47138] Pin Jinja2 to fix docs build

[Ned Deily]

Ned Deily <nad at python.org> added the comment:


New changeset d97497bf1cc6abd4a9a67d8da4f00cf13b3af4b3 by Steve Dower in branch '3.7':
bpo-47138: Ensure Windows docs build uses the same pinned version as other platforms (GH-32182)
https://github.com/python/cpython/commit/d97497bf1cc6abd4a9a67d8da4f00cf13b3af4b3


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