Bump furo from 2021.10.9 to 2021.11.23 in /requirements

[dependabot]

Bumps furo from 2021.10.9 to 2021.11.23.

Changelog

Sourced from furo's changelog.

2021.11.23 -- Hearty Honeydew

• Improve code block styling.
• Explicitly declare compatibility constraints for pygments.
• Break words in API documentation, when the words are too long.
• Drop the def on function and method signatures.
• Reduce the font-weight in sig-prename.

2021.11.16 -- Grumpy Ghost

• Fix a typo, that broke the sidebar highlight logic.

2021.11.15 -- Fearless Fawn

• Tweak API documentation presentation to match pdoc3's style.
• Bring back browser-specific prefixes, for compatibility.

2021.11.12.1 -- Enamoured Emerald bugfix

• Fix RECORD file contents.

2021.11.12 -- Enamoured Emerald

• Adopt sphinx-theme-builder, which runs the JS-based asset build process during the regular Python build process.
• Rework the build pipeline to be webpack-based.
• Tweak colours in dark mode.
• Present better error messages on misconfiguration.
• Tweak presentation of blockquotes, to be more visually distinct.
• Stylize topics like admonitions, as specified in the reStructuredText spec.
• Handle long single words in the sidebar.
• Only hide Sphinx from the footer, when show_sphinx is set to False.

2021.10.09 -- Delicate Dandelion

• Add a bit more space below content icon container.
• Add CSS variables for table header background and table border.
• Fix behaviour of URL-style references in html_logo and html_favicon.
• Improve selector for embedded-in-text images.
• Improve the contrast ratios in API documentation.

2021.09.22 -- Cavalier Canary

• Restyle API documentation signatures, to have a background and use monospace fonts.
• Reduce spacing for items in API documentation.
• Improve the presentation of links in site-wide announcement.
• Only add a border on code inside paragraphs.
• Use noscript for presenting "search needs JS" message.

2021.09.08 -- Balmy Blue

... (truncated)

Commits

• dfb413b Prepare release: 2021.11.23
• 054df39 Update changelog
• 782574e Reduce the font-weight in sig-prename
• cf8c87b Merge pull request #312 from pradyunsg/pre-commit-ci-update-config
• 5c37bb5 [pre-commit.ci] pre-commit autoupdate
• 3dff135 Add static and class methods to demo module for autodoc
• 940ac49 Drop the def on functions and methods
• 8f4d946 Break words in API docs, when the words are too long
• fe6217c Improve code block styling
• bdcf32e Explicitly declare compatibility against pygments
• Additional commits viewable in compare view

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