Bump astro in the dependencies group across 1 directory

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


Updates `astro` from 5.12.3 to 5.12.8
- [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: astro
  dependency-version: 5.12.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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

Author: dependabot[bot]

package-lock.json

@@ -31,7 +31,7 @@
   },
   "dependencies": {
     "ace-builds": "^1.35.0",
-    "astro": "^5.12.3",
+    "astro": "^5.12.8",
     "bootstrap": "^5.3.7",
     "htmlhint": "^1.6.3"
   },