move to node 14 & 16

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/create-app/templates/default-app/package.json.hbs

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "private": true,
   "engines": {
-    "node": "12 || 14"
+    "node": "14 || 16"
   },
   "scripts": {
     "dev": "concurrently \"yarn start\" \"yarn start-backend\"",

packages/create-app/templates/default-app/packages/backend/package.json.hbs

@@ -4,9 +4,6 @@
   "main": "dist/index.cjs.js",
   "types": "src/index.ts",
   "private": true,
-  "engines": {
-    "node": "12 || 14"
-  },
   "scripts": {
     "build": "backstage-cli backend:bundle",
     "build-image": "docker build ../.. -f Dockerfile --tag backstage",