fix(react-renderer): Change react-renderer props to interface (#668)

* Change react-renderer props to interface

* Changeset

.changeset/smart-cherries-kick.md

@@ -0,0 +1,5 @@
+---
+'@hono/react-renderer': patch
+---
+
+Change renderer Props type to interface to allow merging

packages/react-renderer/src/index.ts

@@ -1,6 +1,6 @@
 export * from './react-renderer'
 
-export type Props = {}
+export interface Props {}
 
 declare module 'hono' {
   interface ContextRenderer {