fix: rollback module compatibility version to >=3.0.0

Author: Gugustinette

src/module.ts

@@ -36,7 +36,7 @@ export default defineNuxtModule<ModuleOptions>({
     name: 'nuxt-leaflet',
     configKey: 'leaflet',
     compatibility: {
-      nuxt: '>=4.0.0',
+      nuxt: '>=3.0.0',
     },
   },
   // Default configuration options of the Nuxt module