fix(deps): update dependency @textlint/markdown-to-ast to v12.6.1

Author: renovate[bot]

package-lock.json

@@ -35,7 +35,7 @@
   "dependencies": {
     "@bahmutov/cypress-fiddle": "2.6.1",
     "@cypress/browserify-preprocessor": "3.0.2",
-    "@textlint/markdown-to-ast": "12.5.0",
+    "@textlint/markdown-to-ast": "12.6.1",
     "chokidar": "3.5.3",
     "common-tags": "1.8.0",
     "debug": "4.3.1",