chore(deps): bump the github-actions group across 1 directory with 3 updates

Bumps the github-actions group with 3 updates in the / directory: [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight), [@astrojs/vercel](https://github.com/withastro/astro/tree/HEAD/packages/integrations/vercel) and [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `@astrojs/starlight` from 0.38.3 to 0.38.4
- [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/[email protected]/packages/starlight)

Updates `@astrojs/vercel` from 10.0.4 to 10.0.5
- [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)

Updates `astro` from 6.1.8 to 6.1.9
- [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/[email protected]/packages/astro)

---
updated-dependencies:
- dependency-name: "@astrojs/starlight"
  dependency-version: 0.38.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
- dependency-name: "@astrojs/vercel"
  dependency-version: 10.0.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
- dependency-name: astro
  dependency-version: 6.1.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

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

Author: dependabot[bot]

package-lock.json

@@ -17,10 +17,10 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.8",
-    "@astrojs/starlight": "^0.38.3",
-    "@astrojs/vercel": "^10.0.4",
+    "@astrojs/starlight": "^0.38.4",
+    "@astrojs/vercel": "^10.0.5",
     "@vercel/analytics": "^2.0.1",
-    "astro": "^6.1.8"
+    "astro": "^6.1.9"
   },
   "devDependencies": {
     "@actions/core": "^3.0.1",