chore(deps): bump astro from 5.14.6 to 5.15.1 in the npm group (#983)

Bumps the npm group with 1 update: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 5.14.6 to 5.15.1
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@5.15.1/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm
...

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Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@astrojs/sitemap": "^3.6.0",
     "@astrojs/starlight": "^0.36.1",
-    "astro": "^5.14.6",
+    "astro": "^5.15.1",
     "sharp": "^0.34.4"
   },
   "devDependencies": {