fix(deps): update dependency @textlint/markdown-to-ast to v6.3.4

Author: renovate-bot

package-lock.json

@@ -30,7 +30,7 @@
   "dependencies": {
     "@cypress/browserify-preprocessor": "3.0.1",
     "@cypress/fiddle": "1.19.2",
-    "@textlint/markdown-to-ast": "6.3.3",
+    "@textlint/markdown-to-ast": "6.3.4",
     "chokidar": "3.5.1",
     "common-tags": "1.8.0",
     "debug": "4.3.1",