build: Add minimum node version warning

An issue was found when using Node version 24.9 with the latest
package-lock (see #123), one not reproducible with versions 24.12 and
above.  Add a warning that will be shown when running `npm ci`.

package-lock.json

@@ -41,8 +41,11 @@
         "react-test-renderer": "^18.3.1",
         "ts-jest": "^29.4.0"
       },
+      "engines": {
+        "node": "^24.12"
+      },
       "peerDependencies": {
-        "@openedx/frontend-base": "^1.0.0-alpha.7",
+        "@openedx/frontend-base": "^1.0.0-alpha.8",
         "@openedx/paragon": "^23",
         "react": "^18",
         "react-dom": "^18",

package.json

@@ -2,6 +2,9 @@
   "name": "@openedx/frontend-app-authn",
   "version": "1.0.0-alpha.4",
   "description": "Frontend authentication",
+  "engines": {
+    "node": "^24.12"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/openedx/frontend-app-authn.git"