Bump @astrojs/rss from 4.0.14 to 4.0.15 (#3348)

Bumps [@astrojs/rss](https://github.com/withastro/astro/tree/HEAD/packages/astro-rss) from 4.0.14 to 4.0.15.
- [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@4.0.15/packages/astro-rss)

---
updated-dependencies:
- dependency-name: "@astrojs/rss"
  dependency-version: 4.0.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

landing/package.json

@@ -19,7 +19,7 @@
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.6",
-    "@astrojs/rss": "^4.0.14",
+    "@astrojs/rss": "^4.0.15",
     "@astrojs/sitemap": "^3.6.0",
     "@tailwindcss/typography": "^0.5.19",
     "@tailwindcss/vite": "^4.1.18",