Bump loader.js from 4.5.1 to 4.7.0

Bumps [loader.js](https://github.com/ember-cli/loader.js) from 4.5.1 to 4.7.0.
- [Release notes](https://github.com/ember-cli/loader.js/releases)
- [Commits](https://github.com/ember-cli/loader.js/commits/v4.7.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -80,7 +80,7 @@
     "eslint-plugin-ember": "^7.7.2",
     "eslint-plugin-prettier": "^3.1.2",
     "faker": "^4.1.0",
-    "loader.js": "^4.5.1",
+    "loader.js": "^4.7.0",
     "normalize.css": "^7.0.0",
     "nyc": "^14.1.1",
     "prettier": "^1.13.4",