[CI][Docs] Update Sphinx dependencies

[mshr-h]

Fix CI errors on docs generation. Part of #18827

Verifies that docs are generated correctly on local:

• docker/build.sh ci_gpu && python tests/scripts/ci.py docs -d tvm.ci_gpu then
• python tests/scripts/ci.py serve-docs

[gemini-code-assist]

Summary of Changes

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This pull request addresses continuous integration failures related to documentation generation by upgrading key Sphinx-related Python dependencies. The updates ensure compatibility and resolve issues preventing the successful build of documentation, thereby restoring the integrity of the CI pipeline for documentation tasks.

Highlights

• Dependency Updates: Updated several Sphinx-related Python dependencies to newer versions, including autodocsumm, docutils, matplotlib, sphinx, and sphinx_rtd_theme.
• Sphinx-Gallery Specification: Changed the sphinx-gallery dependency from a direct Git URL reference to a specific version 0.20.0.
• TLCpack Sphinx Addon: Updated the Git commit hash for the tlcpack-sphinx-addon dependency.

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Changelog

• docker/install/ubuntu_install_sphinx.sh
  • Updated autodocsumm from 0.2.7 to 0.2.14
  • Updated docutils from 0.16 to 0.21.2
  • Updated matplotlib from 3.3.4 to 3.10.8
  • Updated sphinx from 4.2.0 to 8.1.3
  • Updated sphinx_rtd_theme from 1.0.0 to 3.1.0
  • Changed sphinx-gallery from a Git URL to version 0.20.0
  • Updated the Git hash for tlcpack-sphinx-addon

Activity

• Identified and addressed CI errors occurring during documentation generation.
• Linked to issue [CI] Update images to 20260301-134651-63f099ad #18827, indicating this PR is part of a larger fix.
• Verified successful documentation generation locally using docker/build.sh ci_gpu and python tests/scripts/ci.py docs commands.

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[gemini-code-assist]

Code Review

This pull request updates several Sphinx-related Python dependencies in the ubuntu_install_sphinx.sh script to fix CI errors during documentation generation. The changes involve updating package versions to more recent ones and replacing a git-based dependency for sphinx-gallery with a pinned version from PyPI. My review includes a suggestion to improve maintainability by moving the list of dependencies into a separate requirements.txt file.

[mshr-h]

ready to go
cc @tqchen @yongwww