Add missing type

Author: lcharette

package.json

@@ -18,6 +18,7 @@
         "@rushstack/eslint-patch": "^1.8.0",
         "@symfony/webpack-encore": "^4.4.0",
         "@tsconfig/node20": "^20.1.4",
+        "@types/luxon": "^3.4.2",
         "@types/node": "^20.12.5",
         "@types/uikit": "^3.14.5",
         "@vitejs/plugin-vue": "^5.0.4",