Bump markdown-it-deflist from 2.1.0 to 3.0.0 (sass#912)

Bumps [markdown-it-deflist](https://github.com/markdown-it/markdown-it-deflist) from 2.1.0 to 3.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-deflist/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-deflist@2.1.0...3.0.0)

---
updated-dependencies:
- dependency-name: markdown-it-deflist
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -83,7 +83,7 @@
     "markdown-it": "^13.0.2",
     "markdown-it-anchor": "^8.6.7",
     "markdown-it-attrs": "^4.1.6",
-    "markdown-it-deflist": "^2.1.0",
+    "markdown-it-deflist": "^3.0.0",
     "markdown-it-footnote": "^4.0.0",
     "netlify-plugin-11ty": "^1.4.0",
     "npm-run-all": "^4.1.5",