build(deps): bump @astrojs/starlight from 0.42.6 to 0.42.7

Bumps [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) from 0.42.6 to 0.42.7.
- [Release notes](https://github.com/withastro/starlight/releases)
- [Changelog](https://github.com/withastro/starlight/blob/main/packages/starlight/CHANGELOG.md)
- [Commits](https://github.com/withastro/starlight/commits/@astrojs/starlight@0.42.7/packages/starlight)

---
updated-dependencies:
- dependency-name: "@astrojs/starlight"
  dependency-version: 0.42.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -9,7 +9,7 @@
     "preview": "astro preview"
   },
   "dependencies": {
-    "@astrojs/starlight": "^0.42.6",
+    "@astrojs/starlight": "^0.42.7",
     "@astrojs/svelte": "^9.1.1",
     "astro": "^7.4.2",
     "svelte": "^5.57.2"