Update Sphinx theme (#164147)

[svekars]

Fix links in the top nav bar: pytorch/pytorch_sphinx_theme@71e5574

Pull Request resolved: #164147
Approved by: https://github.com/albanD

(cherry picked from commit e88cca0)

Fixes #ISSUE_NUMBER

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/164254

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❌ 1 New Failure

As of commit 0ef0aa2 with merge base 4840a1a ():

NEW FAILURE - The following job has failed:

• docker-builds / docker-build (linux.12xlarge, pytorch-linux-noble-riscv64-py3.12-gcc14) (gh)
  Final attempt failed. Child_process exited with error code 1

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