Update myst-parser requirement from ~=3.0.0 to ~=4.0.0

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@v3.0.0...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -42,7 +42,7 @@ test = [
 ]
 docs = [
     "furo ~= 2024.8.6",
-    "myst-parser ~= 3.0.0",
+    "myst-parser ~= 4.0.0",
     "sphinx >= 7",
     "sphinx-autodoc-typehints >= 2",
     "sphinx-copybutton ~= 0.5.2",