Added support for Node 16

refs https://github.com/TryGhost/Toolbox/issues/71

- Node 16 is now LTS so we're picking up support for it
- we're also bumping the minimum Node 14 version to 14.17.0 so it
  unblocks merging dependencies
- Admin needs the Node engine range and CI updating
- CI has been updated to the minimum Node 14 range as that is our
  recommended version

ghost/admin/.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: '14.16.1'
+          node-version: '14.17.0'
 
       - run: yarn
       - run: grunt shell:ember:prod
@@ -34,7 +34,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: '14.16.1'
+          node-version: '14.17.0'
 
       - run: yarn
       - run: yarn lint:js
@@ -61,7 +61,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2
         with:
-          node-version: '14.16.1'
+          node-version: '14.17.0'
 
       - run: yarn
       - run: yarn test

ghost/admin/package.json

@@ -22,7 +22,7 @@
     "lint:js": "eslint ."
   },
   "engines": {
-    "node": "^12.22.1 || ^14.16.1"
+    "node": "^12.22.1 || ^14.17.0 || ^16.13.0"
   },
   "devDependencies": {
     "@ember/jquery": "2.0.0",