Update dependency ember-auto-import to v2.7.3

Author: renovate[bot]

package.json

@@ -30,7 +30,7 @@
     "babel-eslint": "10.1.0",
     "broccoli-asset-rev": "3.0.0",
     "ember-a11y-refocus": "2.3.0",
-    "ember-auto-import": "2.2.4",
+    "ember-auto-import": "2.7.3",
     "ember-cli": "3.28.6",
     "ember-cli-autoprefixer": "2.0.0",
     "ember-cli-babel": "7.26.11",