chore(deps): update dependency sphinx to v8.2.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
sphinx (changelog)	==8.1.3 → ==8.2.3

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Configuration

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♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: uv.lock

Command failed: uv lock --upgrade-package sphinx
Using CPython 3.14.2 interpreter at: /opt/containerbase/tools/python/3.14.2/bin/python3
  × No solution found when resolving dependencies for split (markers:
  │ python_full_version == '3.10.*'):
  ╰─▶ Because the requested Python version (>=3.9) does not satisfy
      Python>=3.11 and geometer:docs depends on sphinx{python_full_version
      == '3.10.*'}==8.2.3, we can conclude that geometer:docs's requirements
      are unsatisfiable.
      And because your project requires geometer:docs, we can conclude that
      your project's requirements are unsatisfiable.

      hint: While the active Python version is 3.14, the resolution failed for
      other Python versions supported by your project. Consider limiting your
      project's supported Python versions using `requires-python`.