Bump furo from 2021.6.24b37 to 2021.7.31b41 in /requirements

[dependabot[bot]]

Bumps furo from 2021.6.24b37 to 2021.7.31b41.

Changelog

Sourced from furo's changelog.

Changelog

2021.07.31.beta41

• Adapt for newer sphinx-copybutton design
• Improved screen reader experience
• Bring back asset digests, to avoid caching-related issues

2021.07.28.beta40

• Add spacing around light theme / dark theme / auto theme toggle.

2021.07.28.beta39

• Site visitors can now force light theme / dark theme, independently of browser settings. 🎉
• Rework handling of dark theme code block highlighting.
• "Hide Search Matches" shows up in the sidebar, when the user has search matches highlighted.
• Search term highlights are only shown in the page content.
• Fix styling for default aligned tables.
• Enable smooth scrolling.
• meta: Upgrade NodeJS packages and start using Babel.
• meta: Rework organisation of various user-facing CSS variables.

2021.07.05.beta38

• Fix image alignment in Sphinx 4.

2021.06.24.beta37

• Require Sphinx 4.
• Rework CSS/JS asset inclusion, to work better with Sphinx 4.
• Document how to add a custom admonition style.

2021.06.18.beta36

• Fix dark mode highlighting in Sphinx 4.

2021.06.18.beta35

• Allow use with Sphinx 4.
• Fix right alignment of viewcode links, when used with certain API signatures.

2021.04.11.beta34

• Account for even more variants of sidebar-caption HTML.

2021.04.11.beta33

• Another styling update sidebar-caption related changes in Sphinx.

... (truncated)

Commits

• 7f8d532 Prepare release: 2021.07.31.beta41
• e364dce Update changelog
• 7835202 Accessibility/search bar label (#208)
• 11dc2ee Bring back asset digests
• 2152227 :art:
• 44ad20e Add visually hidden content to labels
• bd5c77b Only have one element with main role
• 272f4cb Make the site-wide sidebar more screen-reader friendly
• 5990477 Remove "Home" from the home page's <title>
• 3fcf03f Use a higher contrast color for accessibility
• Additional commits viewable in compare view

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