chore(deps-dev): bump eslint-plugin-ember from 8.3.0 to 8.4.0 (#4320)

Bumps [eslint-plugin-ember](https://github.com/ember-cli/eslint-plugin-ember) from 8.3.0 to 8.4.0.
- [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@v8.3.0...v8.4.0)

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

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

Author: dependabot-preview[bot]

package.json

@@ -123,7 +123,7 @@
     "ember-table": "^2.2.3",
     "ember-truth-helpers": "^2.1.0",
     "ember-uuid": "^2.1.0",
-    "eslint-plugin-ember": "^8.3.0",
+    "eslint-plugin-ember": "^8.4.0",
     "eslint-plugin-ember-suave": "^2.0.1",
     "eslint-plugin-node": "^11.1.0",
     "fastboot-app-server": "^2.0.0",

yarn.lock

@@ -7371,10 +7371,10 @@ eslint-plugin-ember@^6.4.1:
     ember-rfc176-data "^0.3.11"
     snake-case "^2.1.0"
 
-eslint-plugin-ember@^8.3.0:
-  version "8.3.0"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-ember/-/eslint-plugin-ember-8.3.0.tgz#64a1158ca7f51c150529eadd6396b4066ec6d053"
-  integrity sha512-uEDiZsEQm4N6ELtIPi/L+YecwD/4Z+3gFqMgHrgxd2Rz9WWQ5Y6IzM87+Nurmo456uB2NCZ8R+DMD1L+pKo7pw==
+eslint-plugin-ember@^8.4.0:
+  version "8.4.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-ember/-/eslint-plugin-ember-8.4.0.tgz#bf66c1abf76b1039c8c253bf755b06382dd5c2b9"
+  integrity sha512-jzSpyA3+aQrEHydo3Tz8cNAbgmtYVlp0eSe8X52OsHYLdVc7i4vzMwA+ptfO06dzpLQNHWW5ziprB5hoAEt95A==
   dependencies:
     "@ember-data/rfc395-data" "^0.0.4"
     ember-rfc176-data "^0.3.12"