build(deps-dev): bump myst-parser from 0.17.2 to 0.18.1 (#27)

Bumps [myst-parser](https://github.com/executablebooks/MyST-Parser) from 0.17.2 to 0.18.1.
- [Release notes](https://github.com/executablebooks/MyST-Parser/releases)
- [Changelog](https://github.com/executablebooks/MyST-Parser/blob/master/CHANGELOG.md)
- [Commits](executablebooks/MyST-Parser@v0.17.2...v0.18.1)

---
updated-dependencies:
- dependency-name: myst-parser
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -12,7 +12,7 @@ exceptiongroup = {version = "^1.0.0-rc.3"}
 injector = {version = ">=0.19,<0.21", optional = true}
 
 [tool.poetry.group.docs.dependencies]
-myst-parser = "^0.17.2"
+myst-parser = ">=0.17.2,<0.19.0"
 sphinx-artisan-theme = "^0.0.1-beta.1"
 autodocsumm = "^0.2.8"
 sphinx-autobuild = "^2021.3.14"