Bump sphinx from 1.8.3 to 4.0.3

[dependabot-preview]

Bumps sphinx from 1.8.3 to 4.0.3.

Changelog

Sourced from sphinx's changelog.

Release 4.0.3 (released Jul 05, 2021)

Features added

• C, add C23 keywords _Decimal32, _Decimal64, and _Decimal128.
• #9354: C, add :confval:c_extra_keywords to allow user-defined keywords during parsing.
• Revert the removal of sphinx.util:force_decode() to become some 3rd party extensions available again during 5.0

Bugs fixed

• #9330: changeset domain: :rst:dir:versionchanged with contents being a list will cause error during pdf build
• #9313: LaTeX: complex table with merged cells broken since 4.0
• #9305: LaTeX: backslash may cause Improper discretionary list pdf build error with Japanese engines
• #9354: C, remove special macro names from the keyword list. See also :confval:c_extra_keywords.
• #9322: KeyError is raised on PropagateDescDomain transform

Release 4.0.2 (released May 20, 2021)

Dependencies

• #9216: Support jinja2-3.0

Incompatible changes

• #9222: Update Underscore.js to 1.13.1
• #9217: manpage: Stop creating a section directory on build manpage by default (see :confval:man_make_section_directory)

Bugs fixed

• #9210: viewcode: crashed if non importable modules found on parallel build
• #9240: Unknown node error for pending_xref_condition is raised if an extension that does not support the node installs a missing-reference handler

Release 4.0.1 (released May 11, 2021)

Bugs fixed

... (truncated)

Commits

• 007795d Bump to 4.0.3 final
• 779d902 Merge pull request #9326 from tk0miya/rebirth_of_force_decode
• a1994ac Merge branch '4.0.x' into rebirth_of_force_decode
• 723ad78 Merge pull request #9334 from tk0miya/9322_KeyError_from_PropageteDescDomain
• 072cdf2 Merge branch '4.0.x' into 9322_KeyError_from_PropageteDescDomain
• df5764d Merge pull request #9356 from jakobandersen/c_extra_keywords
• 50f5280 C, keyword changes
• 8939a75 Merge pull request #9335 from jfbu/9305_platex_backslash_upquote
• ef9b55c Fix #9305 LaTeX: backslash in sphinxupquote error with Japanese
• 7673cd6 Merge pull request #9333 from tk0miya/9330_versionchanged_breaks_list
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

[dependabot-preview]

Superseded by #615.