chore(deps-dev): bump @metalsmith/markdown from 1.9.1 to 1.10.0

Bumps [@metalsmith/markdown](https://github.com/metalsmith/markdown) from 1.9.1 to 1.10.0.
- [Release notes](https://github.com/metalsmith/markdown/releases)
- [Changelog](https://github.com/metalsmith/markdown/blob/main/CHANGELOG.md)
- [Commits](metalsmith/markdown@v1.9.1...v1.10.0)

---
updated-dependencies:
- dependency-name: "@metalsmith/markdown"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -21,7 +21,7 @@
   "devDependencies": {
     "@metalsmith/collections": "^1.3.0",
     "@metalsmith/layouts": "^2.7.0",
-    "@metalsmith/markdown": "^1.9.1",
+    "@metalsmith/markdown": "^1.10.0",
     "@metalsmith/permalinks": "^2.4.1",
     "@metalsmith/postcss": "^5.3.0",
     "@metalsmith/remove": "^1.3.0",