[Docs Site] Bump @astrojs/rss from 4.0.8 to 4.0.9 (#17645)

Bumps [@astrojs/rss](https://github.com/withastro/astro/tree/HEAD/packages/astro-rss) from 4.0.8 to 4.0.9.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro-rss/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/astro-rss)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
 		"@astro-community/astro-embed-youtube": "^0.5.5",
 		"@astrojs/check": "^0.9.4",
 		"@astrojs/react": "^3.6.2",
-		"@astrojs/rss": "^4.0.8",
+		"@astrojs/rss": "^4.0.9",
 		"@astrojs/sitemap": "^3.2.1",
 		"@astrojs/starlight": "^0.28.3",
 		"@astrojs/starlight-docsearch": "^0.2.0",