chore: 🤖 update @glimmer/component to v2 (#2871)

* chore: 🤖 update @glimmer/component to v2

* chore: 🤖 bump ember-a11y-refocus to fix focus errors in tests

Previous runs had three failing tests related to focusing from
ember-a11y-refocus:
* global failure: TypeError: Cannot read properties of null (reading 'focus')

Tests failing with this error were fixed as part of this PR:
https://github.com/ember-a11y/ember-a11y-refocus/pull/347

After bumping to a later version of ember-a11y-refocus, the
existing failing tests now pass

addons/rose/package.json

@@ -52,7 +52,7 @@
     "@ember/optional-features": "^2.1.0",
     "@ember/test-helpers": "^5.2.1",
     "@embroider/test-setup": "^4.0.0",
-    "@glimmer/component": "^1.1.2",
+    "@glimmer/component": "^2.0.0",
     "@glimmer/tracking": "^1.1.2",
     "broccoli-asset-rev": "^3.0.0",
     "concurrently": "^9.1.0",