fix(deps): update dependency md-editor-v3 to v6

Author: renovate[bot]

package.json

@@ -246,7 +246,7 @@
     "markdown-table-prettify": "^3.7.0",
     "marked": "^10.0.0",
     "mathjs": "^15.1.0",
-    "md-editor-v3": "^4.21.3",
+    "md-editor-v3": "^6.0.0",
     "memorystream": "^0.3.1",
     "merge-anything": "^6.0.6",
     "mermaid": "^11.12.2",