update ecmarkup

Author: erights

package.json

@@ -16,8 +16,8 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "@tc39/ecma262-biblio": "^2.1.2775",
-    "ecmarkup": "^20.0.0",
+    "@tc39/ecma262-biblio": "2.1.2862",
+    "ecmarkup": "^21.2.0",
     "jsdom": "^25.0.1",
     "parse5-html-rewriting-stream": "^7.0.0",
     "tmp": "^0.2.3"