Build(deps-dev): Bump @glint/environment-ember-loose from 1.1.0 to 1.2.1

Bumps [@glint/environment-ember-loose](https://github.com/typed-ember/glint) from 1.1.0 to 1.2.1.
- [Release notes](https://github.com/typed-ember/glint/releases)
- [Changelog](https://github.com/typed-ember/glint/blob/main/.release-it.yml)
- [Commits](typed-ember/glint@1.1.0...1.2.1)

---
updated-dependencies:
- dependency-name: "@glint/environment-ember-loose"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -52,7 +52,7 @@
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
     "@glint/core": "^1.2.1",
-    "@glint/environment-ember-loose": "^1.1.0",
+    "@glint/environment-ember-loose": "^1.2.1",
     "@glint/template": "^1.2.1",
     "@jaames/iro": "^5.5.2",
     "@orbit/coordinator": "^0.17.0",