Bump md-editor-v3 from 4.21.2 to 4.21.3

Bumps [md-editor-v3](https://github.com/imzbf/md-editor-v3) from 4.21.2 to 4.21.3.
- [Release notes](https://github.com/imzbf/md-editor-v3/releases)
- [Commits](imzbf/md-editor-v3@v4.21.2...v4.21.3)

---
updated-dependencies:
- dependency-name: md-editor-v3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "@picocss/pico": "^2.0.6",
-    "md-editor-v3": "^4.21.2",
+    "md-editor-v3": "^4.21.3",
     "simple-image-compressor": "^1.8.2",
     "vitepress": "^1.3.4"
   },