Update internal nlcst-to-string

Author: wooorm

package.json

@@ -37,7 +37,7 @@
     "@types/mdast": "^4.0.0",
     "@types/nlcst": "^2.0.0",
     "@types/unist": "^3.0.0",
-    "nlcst-to-string": "^3.0.0",
+    "nlcst-to-string": "^4.0.0",
     "unist-util-position": "^5.0.0",
     "vfile": "^6.0.0",
     "vfile-location": "^5.0.0"