Update nbsphinx requirement from ~=0.8.12 to ~=0.9.1

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Updates the requirements on nbsphinx to permit the latest version.

Release notes

Sourced from nbsphinx's releases.

nbsphinx 0.9.1

https://pypi.org/project/nbsphinx/0.9.1/

• pandoc: disable "smart" option only for version 2.0+

Changelog

Sourced from nbsphinx's changelog.

Version 0.9.1 -- 2023-03-14 -- PyPI__ -- diff__

• pandoc: disable "smart" option only for version 2.0+

__ https://pypi.org/project/nbsphinx/0.9.1/ __ https://github.com/spatialaudio/nbsphinx/compare/0.9.0...0.9.1

Version 0.9.0 -- 2023-03-12 -- PyPI__ -- diff__

• Split nbsphinx.py (a Python module) into:

  • nbsphinx/__init__.py (a Python package)
  • A standalone CSS file nbsphinx-code-cells.css_t
  • LaTeX style file nbsphinx.sty

• Add custom HTML/CSS for thumbnail galleries

  • Separate CSS file nbsphinx-gallery.css
  • The CSS from Sphinx Gallery ('sphinx_gallery.load_style') cannot be used anymore

• Use the last image in a notebook as the default thumbnail

__ https://pypi.org/project/nbsphinx/0.9.0/ __ https://github.com/spatialaudio/nbsphinx/compare/0.8.12...0.9.0

Version 0.8.12 -- 2023-01-19 -- PyPI__ -- diff__

• Implement "link" galleries (without nested sub-documents)

__ https://pypi.org/project/nbsphinx/0.8.12/ __ https://github.com/spatialaudio/nbsphinx/compare/0.8.11...0.8.12

Version 0.8.11 -- 2022-12-29 -- PyPI__ -- diff__

• LaTeX: apply code cell border style to all code blocks

__ https://pypi.org/project/nbsphinx/0.8.11/ __ https://github.com/spatialaudio/nbsphinx/compare/0.8.10...0.8.11

Version 0.8.10 -- 2022-11-13 -- PyPI__ -- diff__

• Fix handling of source_suffix
• A few LaTeX fixes

__ https://pypi.org/project/nbsphinx/0.8.10/ __ https://github.com/spatialaudio/nbsphinx/compare/0.8.9...0.8.10

Version 0.8.9 -- 2022-06-04 -- PyPI__ -- diff__

• CSS: support tables in widgets
• Avoid empty "raw" directive

__ https://pypi.org/project/nbsphinx/0.8.9/ __ https://github.com/spatialaudio/nbsphinx/compare/0.8.8...0.8.9

... (truncated)

Commits

• c229f7a Release 0.9.1
• e79b3fd pandoc: disable "smart" option only for version 2.0+
• 71a12c6 Release 0.9.0
• 9fd867f Fix default thumbnail implementation, some documentation changes
• 590a127 Demonstrate default thumbnails in the documentation
• 21b9063 Make implicit thumbnails lower priority than explicit
• 9d5a178 Use the last image in a notebook as the default thumbnail
• 148b1bf Handle quotes in section titles
• e2fb8b7 DOC: LaTeX: draw full box around notes
• 4df8cb3 DOC: separate source file for references
• Additional commits viewable in compare view

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