test: fix typecheck test by adding luxon types

Author: kerwanp

package.json

@@ -66,6 +66,7 @@
     "@japa/plugin-adonisjs": "^3.0.1",
     "@japa/runner": "^3.1.4",
     "@swc/core": "^1.6.3",
+    "@types/luxon": "^3.4.2",
     "@types/node": "^20.14.5",
     "@types/sinon": "^17.0.3",
     "algoliasearch": "^5.6.1",