Remove ember-destroyable-polyfill from dependencies

Removed ember-destroyable-polyfill dependency.

Author: NullVoxPopuli

addon/package.json

@@ -34,7 +34,6 @@
   },
   "dependencies": {
     "@embroider/addon-shim": "^1.8.4",
-    "ember-destroyable-polyfill": "^2.0.3",
     "ember-modifier": "^2.1.2 || ^3.1.0 || ^4.0.0"
   },
   "devDependencies": {