Bump @astrojs/rss from 4.0.7 to 4.0.9

Bumps [@astrojs/rss](https://github.com/withastro/astro/tree/HEAD/packages/astro-rss) from 4.0.7 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/rss@4.0.9/packages/astro-rss)

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

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

Author: dependabot[bot]

package-lock.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.3",
-    "@astrojs/rss": "^4.0.7",
+    "@astrojs/rss": "^4.0.9",
     "@resvg/resvg-js": "^2.6.2",
     "astro": "^4.16.3",
     "fuse.js": "^7.0.0",