chore: update node engines to >=16.8.0 for undici fetch support

Author: austinkelleher

package.json

@@ -3,6 +3,9 @@
   "version": "2.1.3",
   "description": "Utilities for Node.js core collaborators",
   "type": "module",
+  "engines": {
+    "node": ">=16.8.0"
+  },
   "bin": {
     "get-metadata": "./bin/get-metadata.js",
     "git-node": "./bin/git-node.js",