Update dependency Sphinx to v1.8.6 - abandoned

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Sphinx (changelog)	==1.8.2 -> ==1.8.6

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Release Notes

sphinx-doc/sphinx (Sphinx)

v1.8.6

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Dependencies

• #​9807: Restrict Docutils to 0.17.x or older

v1.8.5

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Bugs fixed

• LaTeX: Remove extraneous space after author names on PDF title page (refs:
  #​6004)
• #​6026: LaTeX: A cross reference to definition list does not work
• #​6046: LaTeX: TypeError is raised when invalid latex_elements given
• #​6067: LaTeX: images having a target are concatenated to next line
• #​6067: LaTeX: images having a target are not aligned even if specified
• #​6149: LaTeX: :index: role in titles causes Use of \@​icentercr doesn't match its definition error on latexpdf build
• #​6019: imgconverter: Including multipage PDF fails
• #​6047: autodoc: autofunction emits a warning for method objects
• #​6028: graphviz: Ensure the graphviz filenames are reproducible
• #​6068: doctest: skipif option may remove the code block from documentation
• #​6136: :name: option for math directive causes a crash
• #​6139: intersphinx: ValueError on failure reporting
• #​6135: changes: Fix UnboundLocalError when any module found
• #​3859: manpage: code-block captions are not displayed correctly

v1.8.4

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Bugs fixed

• #​3707: latex: no bold checkmark (✔) available.
• #​5605: with the documentation language set to Chinese, English words could not
  be searched.
• #​5889: LaTeX: user numfig_format is stripped of spaces and may cause
  build failure
• C++, fix hyperlinks for declarations involving east cv-qualifiers.
• #​5755: C++, fix duplicate declaration error on function templates with
  constraints in the return type.
• C++, parse unary right fold expressions and binary fold expressions.
• pycode could not handle egg files on windows
• #​5928: KeyError: 'DOCUTILSCONFIG' when running build
• #​5936: LaTeX: PDF build broken by inclusion of image taller than page height
  in an admonition
• #​5231: "make html" does not read and build "po" files in "locale" dir
• #​5954: :scale: image option may break PDF build if image in an admonition
• #​5966: mathjax has not been loaded on incremental build
• #​5960: LaTeX: modified PDF layout since September 2018 TeXLive update of
  :file:parskip.sty
• #​5948: LaTeX: duplicated labels are generated for sections
• #​5958: versionadded directive causes crash with Python 3.5.0
• #​5995: autodoc: autodoc_mock_imports conflict with metaclass on Python 3.7
• #​5871: texinfo: a section title . is not allowed

v1.8.3

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Features added

• LaTeX: it is possible to insert custom material to appear on back of title
  page, see discussion of 'maketitle' key of :confval:latex_elements
  ('manual' docclass only)

Bugs fixed

• #​5725: mathjax: Use CDN URL for "latest" version by default
• #​5460: html search does not work with some 3rd party themes
• #​5520: LaTeX, caption package incompatibility since Sphinx 1.6
• #​5614: autodoc: incremental build is broken when builtin modules are imported
• #​5627: qthelp: index.html missing in QtHelp
• #​5659: linkcheck: crashes for a hyperlink containing multibyte character
• #​5754: DOC: Fix some mistakes in :doc:/latex
• #​5810: LaTeX: sphinxVerbatim requires explicit "hllines" set-up since 1.6.6
  (refs: #​1238)
• #​5636: C++, fix parsing of floating point literals.
• #​5496 (again): C++, fix assertion in partial builds with duplicates.
• #​5724: quickstart: sphinx-quickstart fails when $LC_ALL is empty
• #​1956: Default conf.py is not PEP8-compliant
• #​5849: LaTeX: document class \maketitle is overwritten with no
  possibility to use original meaning in place of Sphinx custom one
• #​5834: apidoc: wrong help for --tocfile
• #​5800: todo: crashed if todo is defined in TextElement
• #​5846: htmlhelp: convert hex escaping to decimal escaping in .hhc/.hhk files
• htmlhelp: broken .hhk file generated when title contains a double quote

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