Bump eslint-plugin-ember from 7.8.1 to 7.9.0

Bumps [eslint-plugin-ember](https://github.com/ember-cli/eslint-plugin-ember) from 7.8.1 to 7.9.0.
- [Release notes](https://github.com/ember-cli/eslint-plugin-ember/releases)
- [Changelog](https://github.com/ember-cli/eslint-plugin-ember/blob/master/CHANGELOG.md)
- [Commits](ember-cli/eslint-plugin-ember@v7.8.1...v7.9.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -80,7 +80,7 @@
     "ember-window-mock": "^0.6.0",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.10.0",
-    "eslint-plugin-ember": "^7.8.1",
+    "eslint-plugin-ember": "^7.9.0",
     "eslint-plugin-prettier": "^3.1.2",
     "loader.js": "^4.7.0",
     "normalize.css": "^8.0.1",