fix: config type import (#4524)

Author: applemonkey496

.changeset/thirty-taxis-lick.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+fix import in the config type declarations

packages/astro/config.d.ts

@@ -1,5 +1,5 @@
 type ViteUserConfig = import('vite').UserConfig;
-type AstroUserConfig = import('./dist/types/@types/astro').AstroUserConfig;
+type AstroUserConfig = import('./dist/@types/astro').AstroUserConfig;
 
 /**
  * See the full Astro Configuration API Documentation