build: set minimum engines (Node 20 will be LTS in about a week)

package-lock.json

@@ -55,6 +55,10 @@
         "@types/sharp": "^0.32.0",
         "@types/tailwindcss": "^3.1.0",
         "@types/uuid": "^8.3.1"
+      },
+      "engines": {
+        "node": ">=20.8.0",
+        "npm": ">=10.1.0"
       }
     },
     "node_modules/@alloc/quick-lru": {

package.json

@@ -3,6 +3,10 @@
   "version": "0.15.0-indev",
   "description": "The simple self-hosted ShareX server",
   "main": "dist-backend/app.js",
+  "engines": {
+    "node": ">=20.8.0",
+    "npm": ">=10.1.0"
+  },
   "scripts": {
     "dev": "npm run build && npm start",
     "build": "rm -dr dist-*/ & npm run build:backend && npm run build:frontend",