fix: import defineNitroPlugin from #imports

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Co-authored-by: Farnabaz <farnabaz@gmail.com>

src/runtime/server/plugins/refresh-cache.ts

@@ -1,7 +1,6 @@
-import { defineNitroPlugin } from 'nitropack/runtime'
 import type { WatchEvent } from 'unstorage';
 // @ts-expect-error
-import { useStorage } from '#imports'
+import { useStorage, defineNitroPlugin } from '#imports'
 
 export default defineNitroPlugin(async (nitro) => {
   const { cleanCachedContents } = await import('../storage')