Update sphinx requirement from <6,>=4 to >=4,<7 in /requirements

[dependabot[bot]]

Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

v6.0.0

Changelog: https://www.sphinx-doc.org/en/master/changes.html

Changelog

Sourced from sphinx's changelog.

Release 6.0.0 (released Dec 29, 2022)

Dependencies

• #10468: Drop Python 3.6 support
• #10470: Drop Python 3.7, Docutils 0.14, Docutils 0.15, Docutils 0.16, and Docutils 0.17 support. Patch by Adam Turner

Incompatible changes

• #7405: Removed the jQuery and underscore.js JavaScript frameworks.

  These frameworks are no longer be automatically injected into themes from Sphinx 6.0. If you develop a theme or extension that uses the jQuery, $, or $u global objects, you need to update your JavaScript to modern standards, or use the mitigation below.

  The first option is to use the sphinxcontrib.jquery_ extension, which has been developed by the Sphinx team and contributors. To use this, add sphinxcontrib.jquery to the extensions list in conf.py, or call app.setup_extension("sphinxcontrib.jquery") if you develop a Sphinx theme or extension.

  The second option is to manually ensure that the frameworks are present. To re-add jQuery and underscore.js, you will need to copy jquery.js and underscore.js from the Sphinx repository_ to your static directory, and add the following to your layout.html:

  .. code-block:: html+jinja

  {%- block scripts %} {{ super() }} {%- endblock %}

  .. _sphinxcontrib.jquery: https://github.com/sphinx-contrib/jquery/

  Patch by Adam Turner.

• #10471, #10565: Removed deprecated APIs scheduled for removal in Sphinx 6.0. See :ref:dev-deprecated-apis for details. Patch by Adam Turner.

• #10901: C Domain: Remove support for parsing pre-v3 style type directives and roles. Also remove associated configuration variables c_allow_pre_v3 and c_warn_on_allowed_pre_v3. Patch by Adam Turner.

Features added

... (truncated)

Commits

• 5b56a23 Bump to 6.0.0 final
• f1d1e9c Update coverage workflow for Tox 4
• 66a738c Update coverage workflow for new configuration location
• 041e5f8 Add test coverage for 'today_fmt' reference substitution (#10980)
• da25145 Remove unnecessary conditional import in sphinx.ext.napoleon (#11043)
• 45a0ea9 Migrate coveragepy config into pyproject.toml (#11025)
• 3ec54f1 Create a pydata_sphinx_theme section in usage examples (#11046)
• 32bce8f Copy edit the tutorial (#11049)
• 9844162 Fix example using add_config_value (#10937)
• bf4a626 RTD builder: add graphviz depedendency (#11040)
• Additional commits viewable in compare view

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Superseded by #115.