Disable markdown-it types update

[rajsite]

Pull Request

🤨 Rationale

The @types/markdown-it updates were disabled due to an issue in prosemirror-markdown. See #2326

👩‍💻 Implementation

Disabled @types/markdown-it in the renovate config.

🧪 Testing

Will see if the renovate merge PR is successful after.

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[rajsite]

@jattasNI bypassing on straightforward major updates renovate disable