fix(nuxt): usePinia composable type (#2890)

Co-authored-by: Eduardo San Martin Morote <[email protected]>
Co-authored-by: Bruno <[email protected]>

Author: 3 people

packages/nuxt/src/runtime/composables.ts

@@ -1,4 +1,5 @@
 import { useNuxtApp } from '#app'
+import type { Pinia } from 'pinia'
 export * from 'pinia'
 
-export const usePinia = () => useNuxtApp().$pinia
+export const usePinia = () => useNuxtApp().$pinia as Pinia