unused dependency 'sitemap', 'filter' option should return boolean (#3563)

* refactor: @astrojs/sitemap does't use 'sitemap' pkg

* refactor: 'filter' option should return boolean instead of string

* fix: forgotten `pnpm install`

* chore: add changeset

Co-authored-by: Nate Moore <nate@skypack.dev>

Author: alextim

.changeset/nice-zebras-unite.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/sitemap': patch
+---
+
+Remove unused dependency

packages/integrations/sitemap/package.json

@@ -27,7 +27,6 @@
     "dev": "astro-scripts dev \"src/**/*.ts\""
   },
   "dependencies": {
-    "sitemap": "^7.1.1"
   },
   "devDependencies": {
     "astro": "workspace:*",

packages/integrations/sitemap/src/index.ts

@@ -15,7 +15,7 @@ type SitemapOptions =
 			 * filter: (page) => page !== 'http://example.com/secret-page'
 			 * ```
 			 */
-			filter?(page: string): string;
+			filter?(page: string): boolean;
 
 			/**
 			 * If you have any URL, not rendered by Astro, that you want to include in your sitemap,