Update composer to remove deprecated dependency (#5165)

composer.json

@@ -4,9 +4,6 @@
   "type": "component",
   "homepage": "https://select2.org/",
   "license": "MIT",
-  "require": {
-    "robloach/component-installer": "*"
-  },
   "extra": {
     "component": {
       "scripts": [