remove google-closure-compiler

Google is stopping support

Author: greggman

package-lock.json

@@ -57,7 +57,6 @@
     "eslint-plugin-optional-comma-spacing": "^0.0.4",
     "eslint-plugin-require-trailing-comma": "^0.0.1",
     "express": "^4.19.2",
-    "google-closure-compiler": "^20230228.0.0",
     "mocha": "^10.4.0",
     "rollup": "^4.17.2",
     "showdown": "^2.1.0",