Bump @astrojs/sitemap from 3.0.2 to 3.0.3

Bumps [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/sitemap/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/sitemap@3.0.3/packages/integrations/sitemap)

---
updated-dependencies:
- dependency-name: "@astrojs/sitemap"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -23,7 +23,7 @@
 	"dependencies": {
 		"@astrojs/check": "0.3.0",
 		"@astrojs/prefetch": "0.4.1",
-		"@astrojs/sitemap": "3.0.2",
+		"@astrojs/sitemap": "3.0.3",
 		"@tailwindcss/aspect-ratio": "0.4.2",
 		"@tailwindcss/forms": "0.5.6",
 		"@tailwindcss/typography": "0.5.10",