Bump markdown-it-mark from 3.0.1 to 4.0.0

Bumps [markdown-it-mark](https://github.com/markdown-it/markdown-it-mark) from 3.0.1 to 4.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-mark/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-mark@3.0.1...4.0.0)

---
updated-dependencies:
- dependency-name: markdown-it-mark
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -37,7 +37,7 @@
  "markdown-it-anchor": "^8.6.7",
  "markdown-it-attrs": "^4.1.6",
  "markdown-it-footnote": "^3.0.3",
- "markdown-it-mark": "^3.0.1",
+ "markdown-it-mark": "^4.0.0",
  "markdown-it-mathjax3": "^4.3.1",
  "markdown-it-plantuml": "^1.4.1",
  "markdown-it-task-checkbox": "^1.0.6",