Bump myst-parser from 1.0.0 to 2.0.0 in /docs/readthedocs

Bumps [myst-parser](https://github.com/executablebooks/MyST-Parser) from 1.0.0 to 2.0.0.
- [Release notes](https://github.com/executablebooks/MyST-Parser/releases)
- [Changelog](https://github.com/executablebooks/MyST-Parser/blob/master/CHANGELOG.md)
- [Commits](executablebooks/MyST-Parser@v1.0.0...v2.0.0)

---
updated-dependencies:
- dependency-name: myst-parser
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/readthedocs/requirements.txt

@@ -2,5 +2,5 @@ commonmark==0.9.1
 recommonmark==0.7.1
 Sphinx==5.3.0
 sphinx-rtd-theme==1.2.2
-myst-parser==1.0.0
+myst-parser==2.0.0
 markdown-it-py==2.2.0