[python]: Update sphinx-rtd-theme requirement from ~=2.0 to ~=3.0

[dependabot[bot]]

Updates the requirements on sphinx-rtd-theme to permit the latest version.

Changelog

Sourced from sphinx-rtd-theme's changelog.

3.0.0

Final version.

.. _release-3.0.0rc4:

3.0.0rc4

Fixes

• Trigger "Read the Docs Search addon" when focusing the "Search docs" input in the navbar.

.. _release-3.0.0rc3:

3.0.0rc3

Fixes

• Show hidden version in selector if it's the current active version

.. _release-3.0.0rc2:

3.0.0rc2

Added

• Render version and language selectors below the documentation's title (top left). This can be controlled via the new theme options version_selector and language_selector.

.. _release-3.0.0rc1:

3.0.0rc1

Added

• Added support for Sphinx 8.
• Added support for Python 3.12.
• Added support for docutils >0.18, <0.22.
• Populate html_context with all the environment variables starting with READTHEDOCS_.

Deprecations

... (truncated)

Commits

• a1c2147 Release 3.0.0
• 814686e Release 3.0.0rc4
• 5b181b8 Trigger search modal on "Search docs" input focus (#1610)
• 7deb68f Release 3.0.0rc3
• 036a3b2 Show hidden version in selector if it's the current active version (#1609)
• ccf3114 Release 3.0.0rc2 (#1607)
• 4cab02f Show version/language selectors below the title (#1601)
• 9c75444 Docs: do not sign Git tag (#1596)
• 3a3473d Release 3.0.0rc1 (#1597)
• 6b587d1 Prepare for 3.0 release (#1576)
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.30%. Comparing base (eba4ada) to head (cc278aa). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #26 +/- ## ======================================= Coverage 99.30% 99.30% ======================================= Files 7 7 Lines 576 576 Branches 123 123 ======================================= Hits 572 572 Misses 2 2 Partials 2 2 ```

:umbrella: View full report in Codecov by Sentry.
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[jwodder]

@dependabot Rebase.

[dependabot[bot]]

Looks like sphinx-rtd-theme is up-to-date now, so this is no longer needed.