Meta: bump ecmarkup to 18.1.0 (#3215)

Author: bakkot

package-lock.json

@@ -23,7 +23,7 @@
   "license": "SEE LICENSE IN https://tc39.es/ecma262/#sec-copyright-and-software-license",
   "homepage": "https://tc39.es/ecma262/",
   "dependencies": {
-    "ecmarkup": "^18.0.0"
+    "ecmarkup": "^18.1.0"
   },
   "devDependencies": {
     "glob": "^7.1.6",