fix the ember-try tests

Author: mikrostew

packages/ember-cli-fastboot/config/ember-try.js

@@ -6,6 +6,10 @@ const { embroiderSafe, embroiderOptimized } = require('@embroider/test-setup');
 module.exports = async function () {
   return {
     useYarn: true,
+    // don't use default `--no-lockfile` option, which has been causing these to fail
+    buildManagerOptions(/* scenario */) {
+      return ['--ignore-engines'];
+    },
     scenarios: [
       {
         name: 'ember-lts-3.16',