Bump @glimmer/component from 1.0.3 to 1.0.4 (#143)

Bumps [@glimmer/component](https://github.com/glimmerjs/glimmer.js) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/glimmerjs/glimmer.js/releases)
- [Changelog](https://github.com/glimmerjs/glimmer.js/blob/master/CHANGELOG.md)
- [Commits](glimmerjs/glimmer.js@v1.0.3...v1.0.4)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -44,7 +44,7 @@
   },
   "devDependencies": {
     "@ember/optional-features": "2.0.0",
-    "@glimmer/component": "1.0.3",
+    "@glimmer/component": "1.0.4",
     "babel-eslint": "10.1.0",
     "broccoli-asset-rev": "3.0.0",
     "ember-auto-import": "1.10.1",