Bump sphinx from 3.5.0 to 3.5.1

[dependabot-preview]

Bumps sphinx from 3.5.0 to 3.5.1.

Changelog

Sourced from sphinx's changelog.

Release 3.5.1 (released Feb 16, 2021)

Bugs fixed

• #8883: autodoc: AttributeError is raised on assigning annotations on read-only class
• #8884: html: minified js stemmers not included in the distributed package
• #8885: html: AttributeError is raised if CSS/JS files are installed via :confval:html_context
• #8880: viewcode: ExtensionError is raised on incremental build after unparsable python module found

Commits

• baed519 Bump to 3.5.1 final
• e2bef2d Merge pull request #8896 from tk0miya/8883_AttributeError_assigning_annotations
• 66539af Merge pull request #8893 from tk0miya/8885_AttributeError_html_context
• 82501a6 Fix #8885: html: AttributeError for CSS/JS files on html_context
• b29ee3d Fix #8883: autodoc: AttributeError on assigning annotations
• 8205283 refactor: html: Fix typo
• 633c5ad Update CHANGES for PR #8888
• 89a1175 Merge pull request #8892 from tk0miya/8888
• ba0fa06 Merge branch '3.5.x' into 8888
• f993f76 Update CHANGES for PR #8886
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 75.492% when pulling ac67c9e on dependabot/pip/sphinx-3.5.1 into a8d435b on master.