Bump furo from 2021.8.31 to 2021.10.9 in /requirements

[dependabot[bot]]

Bumps furo from 2021.8.31 to 2021.10.9.

Changelog

Sourced from furo's changelog.

Changelog

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

• Prevent screen-reader-only content from showing up in Sphinx search results.
• Improve support for various footer configurations.

2021.08.31 -- Aspiring Avocado

• First stable release! 🎉
• Document stability policy.
• Tweak API styling selectors.
• Drop reference to no-longer-used pygments_dark.css.
• Eagerly set the light/dark mode theme, when loading a page.

2021.08.17.beta43

• Add support for sphinx-design.
• Document sidebar title customization.
• Don't show "Contents" on pages without h1 headings.
• Add border to inline code, to improve contrast.
• Reduce contrast on dark-mode text.

2021.08.11.beta42

... (truncated)

Commits

• a955582 Prepare release: 2021.10.09
• 0ea552a Rework how releases are uploaded
• d8add3b Update changelog
• 08ba46d Add a hacky solution, to MyST-parser's bad table output
• ab8a6a9 Merge pull request #274 from humitos/build-readthedocs
• ac81fa8 [pre-commit.ci] auto fixes from pre-commit.com hooks
• e1cdbd1 Execute npx gulp build only on Read the Docs
• 37bfcc4 [pre-commit.ci] auto fixes from pre-commit.com hooks
• dc94eed Build on Read the Docs
• 5527d43 Merge pull request #238 from jdknight/fallback-to-prj-name-for-sidebar-titles
• Additional commits viewable in compare view

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