chore: make it a dev-dependency

Author: ignace

package.json

@@ -61,6 +61,7 @@
     "ember-page-title": "^7.0.0",
     "ember-qunit": "^5.1.5",
     "ember-resolver": "^8.0.3",
+    "ember-shiki": "^0.1.4",
     "ember-source": "~4.4.0",
     "ember-template-lint": "^4.10.0",
     "ember-test-selectors": "^6.0.0",
@@ -83,8 +84,5 @@
   },
   "ember": {
     "edition": "octane"
-  },
-  "dependencies": {
-    "ember-shiki": "^0.1.4"
   }
 }