chore(deps): update dependency ember-cli to v3.28.4

package.json

@@ -33,7 +33,7 @@
     "@types/ember-data": "3.16.15",
     "broccoli-asset-rev": "3.0.0",
     "ember-ajax": "5.0.0",
-    "ember-cli": "3.28.3",
+    "ember-cli": "3.28.4",
     "ember-cli-app-version": "3.2.0",
     "ember-cli-babel": "7.26.6",
     "ember-cli-dependency-checker": "3.2.0",

yarn.lock

@@ -9694,10 +9694,10 @@ ember-cli-version-checker@^5.1.2:
     semver "^7.3.4"
     silent-error "^1.1.1"
 
-[email protected].3:
-  version "3.28.3"
-  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.28.3.tgz#3384c3fb018b58111e30efed15a2f6a9b66b84c3"
-  integrity sha512-DddAQAddbyaOU4NAjTt8g+FoCCK/F00kbj9pcHO1lfAUpIUS9JPBoWxxZ3qO08mUNXi50pdQSPVVRWzN7mNz2g==
+[email protected].4:
+  version "3.28.4"
+  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.28.4.tgz#784cfeaf5319e409edc3e03e5d99bcfcf18f9e53"
+  integrity sha512-bRQpZqx1YctDNR7gb5CXfXYkZtieMh4F6v6bZtu+Da8jWTKoGizG1LXsG/Bhs96USPjlZZsErkSBo6qiGjJlcA==
   dependencies:
     "@babel/core" "^7.13.8"
     "@babel/plugin-transform-modules-amd" "^7.12.1"