Update sphinx requirement from ~=5.3.0 to ~=6.1.3

[dependabot[bot]]

Updates the requirements on sphinx to permit the latest version.

Release notes

Sourced from sphinx's releases.

v6.1.3

Changelog: https://www.sphinx-doc.org/en/master/changes.html

Changelog

Sourced from sphinx's changelog.

Release 6.1.3 (released Jan 10, 2023)

Bugs fixed

• #11116: Reverted to previous Sphinx 5 node copying method
• #11117: Reverted changes to parallel image processing from Sphinx 6.1.0
• #11119: Supress ValueError in the linkcheck builder

Release 6.1.2 (released Jan 07, 2023)

Bugs fixed

• #11101: LaTeX: div.topic_padding key of sphinxsetup documented at 5.1.0 was implemented with name topic_padding

• #11099: LaTeX: shadowrule key of sphinxsetup causes PDF build to crash since Sphinx 5.1.0

• #11096: LaTeX: shadowsize key of sphinxsetup causes PDF build to crash since Sphinx 5.1.0

• #11095: LaTeX: shadow of :dudir:topic and contents_ boxes not in page margin since Sphinx 5.1.0

  .. _contents: https://docutils.sourceforge.io/docs/ref/rst/directives.html#table-of-contents

• #11100: Fix copying images when running under parallel mode.

Release 6.1.1 (released Jan 05, 2023)

Bugs fixed

• #11091: Fix util.nodes.apply_source_workaround for literal_block nodes with no source information in the node or the node's parents.

Release 6.1.0 (released Jan 05, 2023)

Dependencies

• Adopted the Ruff_ code linter.

  .. _Ruff: https://github.com/charliermarsh/ruff

Incompatible changes

... (truncated)

Commits

• 776d01e Bump to 6.1.3 final
• a2e922a CHANGES for Sphinx 6.1.3
• 31162a9 Handle exceptions for get_node_source and get_node_line
• dcb4429 Restore Sphinx 5 nodes.Element copying behaviour
• 2a7c40d Undo parallel image changes
• 7841d3d Ignore more checks in Ruff 0.0.214
• ddbc5b5 Bump version
• 393b408 Bump to 6.1.2 final
• d8a5dd8 Add note to CHANGES for PR 11100
• a1cd19e Fix copying images under parallel execution (#11100)
• Additional commits viewable in compare view

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[Mr0grog]

This version of Sphinx is not yet supported by numpydoc and sphinx_rtd_theme, both of which we depend on. Ignoring for now.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.