Update dependency ember-cli-htmlbars to v7

Author: renovate[bot]

package.json

@@ -37,7 +37,7 @@
     "chalk": "^4.1.2",
     "ember-cli-babel": "^8.2.0",
     "ember-cli-build-config-editor": "^0.5.0",
-    "ember-cli-htmlbars": "^6.3.0",
+    "ember-cli-htmlbars": "^7.0.0",
     "ember-template-imports": "^4.3.0"
   },
   "devDependencies": {