chore(deps): update dependency myst-parser to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
myst-parser	==3.0.1 -> ==4.0.0

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Release Notes

executablebooks/MyST-Parser (myst-parser)

v4.0.0

Compare Source

This release bumps the supported versions of:

• Python to 3.10 and greater
• Sphinx to >=7,<9
• Docutils to >=0.19,<0.22

Additionally, footnotes are now parsed similar to the corresponding reStructuredText, in that resolution (between definitions and references) and ordering is now deferred to transforms on the doctree (in gh-pr:931).

This allows for the proper interaction with other docutils/sphinx transforms, including those that perform translations,
and logging of warnings for duplicate/unreferenced footnote definitions and also for footnote references with no definitions.

See the footnotes guide for more information.

Full Changelog: v3.0.1...v4.0.0

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