wip(ssr): renderer support for optimized and manual slots

packages/runtime-core/src/helpers/renderSlot.ts

@@ -1,7 +1,7 @@
 import { Data } from '../component'
 import { Slot } from '../componentSlots'
 import {
-  VNodeChildren,
+  VNodeArrayChildren,
   openBlock,
   createBlock,
   Fragment,
@@ -15,7 +15,7 @@ export function renderSlot(
   props: Data = {},
   // this is not a user-facing function, so the fallback is always generated by
   // the compiler and guaranteed to be an array
-  fallback?: VNodeChildren
+  fallback?: VNodeArrayChildren
 ): VNode {
   const slot = slots[name]
   return (