chore(deps): bump @astrojs/vercel from 8.1.4 to 8.1.5

Bumps [@astrojs/vercel](https://github.com/withastro/astro/tree/HEAD/packages/integrations/vercel) from 8.1.4 to 8.1.5.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/vercel/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/vercel)

---
updated-dependencies:
- dependency-name: "@astrojs/vercel"
  dependency-version: 8.1.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@astrojs/check": "^0.9.4",
     "@astrojs/starlight": "^0.34.3",
-    "@astrojs/vercel": "^8.1.4",
+    "@astrojs/vercel": "^8.1.5",
     "@vercel/analytics": "^1.5.0",
     "astro": "^5.8.1"
   },