Bump sphinx from 3.1.1 to 3.1.2 in /misc/requirements

[dependabot-preview]

Bumps sphinx from 3.1.1 to 3.1.2.

Changelog

Sourced from sphinx's changelog.

Release 3.1.2 (released Jul 05, 2020)

Incompatible changes

• #7650: autodoc: the signature of base function will be shown for decorated functions, not a signature of decorator

Bugs fixed

• #7844: autodoc: Failed to detect module when relative module name given
• #7856: autodoc: AttributeError is raised when non-class object is given to the autoclass directive
• #7850: autodoc: KeyError is raised for invalid mark up when autodoc_typehints is 'description'
• #7812: autodoc: crashed if the target name matches to both an attribute and module that are same name
• #7650: autodoc: function signature becomes (*args, **kwargs) if the function is decorated by generic decorator
• #7812: autosummary: generates broken stub files if the target code contains an attribute and module that are same name
• #7806: viewcode: Failed to resolve viewcode references on 3rd party builders
• #7838: html theme: List items have extra vertical space
• #7878: html theme: Undesired interaction between "overflow" and "float"

Commits

• 1cb5fa2 Bump to 3.1.2 final
• d83d592 Merge pull request #7878 from mgeier/float-clearing
• c40cb79 Update CHANGES for PR #7878
• 3098aba basic CSS: apply "clearfix" to admonitions etc.
• 045fc68 basic CSS: remove overflow-x from admonition/topic, allow more "floating"
• 3e64373 Merge pull request #7916 from tk0miya/7650_signatures_for_decorator
• 9b74e6c autodoc: the signature of base function will be shown for decorated functions
• cc4534d Update CHANGES for PR #7852
• 2cc6264 Merge pull request #7852 from mgeier/basic-css-simple-lists
• f743df6 Merge pull request #7914 from tk0miya/7812_autodoc_name_conflicts
• Additional commits viewable in compare view

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