chore(nodejs): add engines to package.json

Author: OliverDudgeon

.npmrc

@@ -2,3 +2,4 @@ fund=false
 audit=false
 legacy-peer-deps=true
 loglevel=error
+engine-strict=true

package.json

@@ -8,6 +8,10 @@
     "type": "git",
     "url": "https://github.com/InformaticsMatters/squonk2-data-manager-ui"
   },
+  "engines": {
+    "node": ">=16",
+    "pnpm": ">=6"
+  },
   "scripts": {
     "prepare": "husky install",
     "dev": "next dev",