[issue47138] Bump Sphinx or pin Jinja2 to fix docs build

[Hugo van Kemenade]

Change by Hugo van Kemenade <hugovk+python at gmail.com>:


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pull_requests: +30235
pull_request: https://github.com/python/cpython/pull/32154

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47138>
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