Bump markdown-it from 4.4.0 to 12.3.2

Bumps [markdown-it](https://github.com/markdown-it/markdown-it) from 4.4.0 to 12.3.2.
- [Release notes](https://github.com/markdown-it/markdown-it/releases)
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@4.4.0...12.3.2)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -55,7 +55,7 @@
     "koa-views": "^2.1.0",
     "lodash": "^4.17.19",
     "lru-cache": "^2.5.0",
-    "markdown-it": "^4.4.0",
+    "markdown-it": "^12.3.2",
     "mathsass": "^0.10.1",
     "mime-db": "^1.1.2",
     "ms": "^2.1.2",