requirements: update sphinx requirement from <4.1.2 to <4.1.3

[dependabot]

Updates the requirements on sphinx to permit the latest version.

Changelog

Sourced from sphinx's changelog.

Release 4.1.2 (released Jul 27, 2021)

Incompatible changes

• #9435: linkcheck: Disable checking automatically generated anchors on github.com (ex. anchors in reST/Markdown documents)

Bugs fixed

• #9489: autodoc: Custom types using typing.NewType are not displayed well with the HEAD of 3.10
• #9490: autodoc: Some objects under typing module are not displayed well with the HEAD of 3.10
• #9436, #9471: autodoc: crashed if autodoc_class_signature = "separated"
• #9456: html search: html_copy_source can't control the search summaries
• #9435: linkcheck: Failed to check anchors in github.com

Release 4.1.1 (released Jul 15, 2021)

Dependencies

• #9434: sphinxcontrib-htmlhelp-2.0.0 or above
• #9434: sphinxcontrib-serializinghtml-1.1.5 or above

Bugs fixed

• #9438: html: HTML logo or Favicon specified as file not being found on output

Release 4.1.0 (released Jul 12, 2021)

Dependencies

• Support jinja2-3.0

Deprecated

• The app argument of sphinx.environment.BuildEnvironment becomes required
• sphinx.application.Sphinx.html_theme
• sphinx.ext.autosummary._app
• sphinx.util.docstrings.extract_metadata()

... (truncated)

Commits

• 4ba5c21 Bump to 4.1.2 final
• 4dc45f0 Merge pull request #9494 from tk0miya/9456_revert_9129
• df562b4 Merge branch '4.1.x' into 9456_revert_9129
• 5d8f925 Merge pull request #9493 from tk0miya/9436_autodoc_class_signature
• ef53dec Fix #9456: html search: html_copy_source can't control the search summaries
• 4f364a3 Fix #9436, #9471: autodoc: crashed if autodoc_class_signature = "separated"
• 9218ad4 Merge pull request #9491 from tk0miya/9489_NewType
• 68fb548 Fix #9490: autodoc: Some typing.* objects are broken
• 771507e Fix #9489: autodoc: Custom types using typing.NewType are broken
• 9ebdc98 Merge pull request #9467 from tk0miya/9435_disable_rewrite_github_anchor
• Additional commits viewable in compare view

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[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.7-x64):

Binary files docs-base/.doctrees/environment.pickle and docs-head/.doctrees/environment.pickle differ
diff -r docs-base/_static/searchtools.js docs-head/_static/searchtools.js
279c279
<         } else {
---
>         } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
291a292,297
>         } else {
>           // no source available, just display title
>           Search.output.append(listItem);
>           setTimeout(function() {
>             displayNextItem();
>           }, 5);

...

See CI logs for the full diff.

[coveralls]

Coverage decreased (-0.0004%) to 83.519% when pulling 39abc15 on dependabot/pip/devel/sphinx-lt-4.1.3 into 5f4b74f on devel.

[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.7-x64):

Binary files docs-base/.doctrees/environment.pickle and docs-head/.doctrees/environment.pickle differ
diff -r docs-base/_static/searchtools.js docs-head/_static/searchtools.js
279c279
<         } else {
---
>         } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
291a292,297
>         } else {
>           // no source available, just display title
>           Search.output.append(listItem);
>           setTimeout(function() {
>             displayNextItem();
>           }, 5);

...

See CI logs for the full diff.

[kmantel]

@dependabot squash and merge