Update sphinx-rtd-theme requirement from <3,>=2 to >=2,<4 in /requirements

[dependabot[bot]]

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

Changelog

Sourced from sphinx-rtd-theme's changelog.

3.0.1

• Use black color for text in selectors.

.. _release-3.0.0:

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

... (truncated)

Commits

• 7b894f5 Release 3.0.1
• 1f2439c Use black color for switcher options (#1615)
• 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)
• Additional commits viewable in compare view

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