Update dependency myst-parser to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
myst-parser	==0.19.2 -> ==2.0.0

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Release Notes

executablebooks/MyST-Parser (myst-parser)

v2.0.0

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This release primarily updates core myst-parser dependencies,
with some minor changes to parsing behaviour:

• ⬆️ UPGRADE: markdown-it-py to v3 (gh-pr:773)

  • This is mainly a non-breaking change, fixing some edge cases in parsing
  • See: https://github.com/executablebooks/markdown-it-py/releases/tag/v3.0.0
    and https://github.com/executablebooks/mdit-py-plugins/releases/tag/v0.4.0

• ⬆️ UPGRADE: linkify-it-py to v2 (gh-pr:675)

  • Also fixes some edge cases in parsing
  • See: https://github.com/tsutsu3/linkify-it-py/blob/main/CHANGELOG.md

• ⬆️ UPGRADE: Add support for docutils v0.20 (gh-pr:775)

  • No significant changes, see https://docutils.sourceforge.io/RELEASE-NOTES.html#release-0-20-2023-05-04

• ⬆️ UPGRADE: Add support for sphinx v7, and remove v5 support (gh-pr:776)

  • No significant changes, see https://www.sphinx-doc.org/en/master/changes.html

• ⬆️ UPGRADE: Remove Python 3.7 support and add testing for Python 3.11 (gh-pr:772)

• 👌 Improve default slug generation for heading anchors, thanks to gh-user:Cimbali (gh-pr:777)

  • This change makes the slug generation closer to GitHub, in that, starting/ending whitespace will not be stripped.
    For example, # ` a` b `c ` will now correctly create the slug -a-b-c- and not a-b-c

• 👌 IMPROVE: Substitution extension (gh-pr:777)

  • Allow any value type (including dict, list, datetime) and emit a myst.substitution warning for errors in resolving the substitution content.

• 🧪 Introduce a gate/check GHA job, thanks to gh-user:webknjaz (gh-pr:635)

Full Changelog: v1.0.0...v2.0.0

v1.0.0

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🎉 MyST-Parser 1.0.0 🎉

This changes absolutely nothing in the code, or about the maintenance/release policy of this project.
But it does feel about time 😄

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