[Docker] Switch docs image theme deps to sphinx-book-theme#19835
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For the docs/conf.py migration to sphinx-book-theme, update the ci-gpu docs dependencies: - ubuntu_install_sphinx.sh: replace sphinx_rtd_theme + tlcpack-sphinx-addon with sphinx-book-theme==1.1.4 + pydata-sphinx-theme==0.15.4. - ubuntu_install_python_package.sh: drop the now-unused tlcpack-sphinx-addon pin. sphinx-book-theme 1.1.4 (not 1.2.0) supports both Sphinx 8.1.3 (sphinx>=6.1, no upper bound) and the docs image's Python 3.10 (requires-python>=3.9); 1.2.0 requires Python>=3.11. 1.1.4 hard-pins pydata-sphinx-theme==0.15.4. This is the docker-bump step. After it merges and the rebuilt image is published, ci/jenkins/docker-images.ini is pointed at the new tag; the docs/conf.py theme switch should land together so the rtd-based build is never left without a theme.
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Code Review
This pull request updates the Sphinx documentation setup in the Docker installation scripts. Specifically, it removes the tlcpack-sphinx-addon package from both the general Python package installation and the Sphinx installation scripts. Additionally, it replaces the sphinx_rtd_theme with sphinx-book-theme and pydata-sphinx-theme in the Sphinx installation script. There are no review comments, and I have no feedback to provide.
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For the docs/conf.py migration to sphinx-book-theme, update the ci-gpu docs dependencies:
sphinx-book-theme 1.1.4 (not 1.2.0) supports both Sphinx 8.1.3 (sphinx>=6.1, no upper bound) and the docs image's Python 3.10 (requires-python>=3.9); 1.2.0 requires Python>=3.11. 1.1.4 hard-pins pydata-sphinx-theme==0.15.4.