Rush change.

Author: iclanton

common/changes/@rushstack/lockfile-explorer/update-notifier_2026-04-18-20-41.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/lockfile-explorer",
+      "comment": "Replace `update-notifier` with a simpler built-in solution.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/lockfile-explorer"
+}