`{mermaid}` Directive Broken

[michaelweinold]

What version of myst-parser are you using?

3.0.1-4.0.0

What version dependencies are you using?

name: sphinx_documentation
channels:
  - conda-forge
  - nodefaults
dependencies:
  # core functionality
  - python=3.11
  - ipython
  # sphinx
  - sphinx=7.3.7 # core builder # https://anaconda.org/conda-forge/sphinx/files
  # theme and extensions
  - pydata-sphinx-theme=0.15.3 # website theme # https://anaconda.org/conda-forge/pydata-sphinx-theme/files
  - myst-parser=3.0.1 # Markdown support # https://anaconda.org/conda-forge/myst-parser/files
  - myst-nb=1.1.0 # Jupyter notebook support # https://anaconda.org/conda-forge/myst-nb/files
  - sphinx-autoapi=3.0.0 # to build docs from source code instead of package import # https://anaconda.org/conda-forge/sphinx-autoapi/files
  - sphinx-design=0.5.0 # responsive web component support # https://anaconda.org/conda-forge/sphinx-design/files
  - sphinx-notfound-page=1.0.0 # custom 404 page # https://anaconda.org/conda-forge/sphinx-notfound-page/files
  - graphviz=11.0.0 # for plotting dependency diagrams with sphinx-autoapi # https://anaconda.org/conda-forge/graphviz/files
  - sphinx-favicon=1.0.1 # for custom favicons # https://anaconda.org/conda-forge/sphinx-favicon/files
  - sphinx-copybutton=0.5.2 # for copy button in code blocks # https://anaconda.org/conda-forge/sphinx-copybutton/files
  # build process
  - sphinx-autobuild=2024.4.16 # live-html support # https://anaconda.org/conda-forge/sphinx-autobuild/files

What operating system are you using?

Mac

Describe the Bug

A simple Mermaid diagram like:

```{mermaid}
    graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
```#

won't render, instead throwing an error:

WARNING: Unknown directive type: 'mermaid' [myst.directive_unknown]

Expected Behavior

...a rendered Mermaid diagram.

To Reproduce

No response

[michaelweinold]

...additional installation requirement for sphinxcontrib.mermaid hidden away here.