Use Node 18 and 20 to test and build the theme

.github/workflows/release-management.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 16
+          node-version: 18
           cache: npm
 
       - name: Install

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        node: [ 16, 18 ]
+        node: [ 18, 20 ]
     steps:
     - name: Clone repository
       uses: actions/checkout@v3

package.json

@@ -23,8 +23,8 @@
   },
   "engines": {
     "ghost": ">=5.1.0",
-    "node": ">=16.14.0",
-    "npm": ">=8.3.0"
+    "node": ">=18",
+    "npm": ">=10"
   },
   "scripts": {
     "build": "concurrently \"npm run css\" \"npm run js\"",