chore: update to latest Arborist API

Author: dominykas

lib/deps.js

@@ -31,6 +31,11 @@ internals.resolve = async ({ packageJson, lockfile }, options) => {
 
     for (const dep of arborist.idealTree.inventory.values()) {
 
+        if (dep.root === dep) {
+            // root node is not a dep, really
+            continue;
+        }
+
         if (!options.dev && dep.dev) {
             // only include dev deps when `options.dev` flag is set
             continue;