Bug#1057438: raft: FTBFS: Reason: UndefinedError("'style' is undefined")

[Mathias Gibbens]

  Sphinx 7.0.0 dropped the `style` key
(https://github.com/sphinx-doc/sphinx/pull/11381). Version 7.2.6 was
uploaded to unstable early last month, causing this FTBFS.

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