fix: define empty props in slots for nuxt-component-meta parsing

src/runtime/components/Alert.vue

@@ -46,10 +46,10 @@ export interface AlertEmits {
 }
 
 export interface AlertSlots {
-  leading(): any
-  title(): any
-  description(): any
-  actions(): any
+  leading(props?: any): any
+  title(props?: any): any
+  description(props?: any): any
+  actions(props?: any): any
   close(props: { class: string }): any
 }
 </script>