chore: add type attributes

Author: sapphi-red

packages/plugin-react-swc/tsdown.config.ts

@@ -1,6 +1,6 @@
 import { writeFileSync } from 'node:fs'
 import { defineConfig } from 'tsdown'
-import packageJSON from './package.json'
+import packageJSON from './package.json' with { type: 'json' }
 
 export default defineConfig({
   entry: 'src/index.ts',