Update myst-parser requirement from ==2.* to ==3.* (#472)

Updates the requirements on [myst-parser](https://github.com/executablebooks/MyST-Parser) to permit the latest version.
- [Release notes](https://github.com/executablebooks/MyST-Parser/releases)
- [Changelog](https://github.com/executablebooks/MyST-Parser/blob/master/CHANGELOG.md)
- [Commits](executablebooks/MyST-Parser@v2.0.0...v3.0.0)

---
updated-dependencies:
- dependency-name: myst-parser
  dependency-type: direct:production
...

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Author: dependabot[bot]

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "cwltool",
     "cwlref-runner",
     "cwl-utils==0.*",
-    "myst-parser==2.*",
+    "myst-parser==3.*",
     "pydata-sphinx-theme==0.*",
     "sphinx==7.*",
     "sphinx-reredirects==0.1.*",